Coal blending method for controlling strength of coke DI15015

Abstract

The invention discloses a coal blending method for controlling coke DI15015 strength, which comprises the following steps: S1, measuring the softening temperature and the solid-soft temperature interval of a coking coal source, and classifying the coal source according to the softening temperature and the solid-soft temperature interval; s2, matching according to the classification of the coal sources to obtain mixed coal; and S3, crushing the mixed coal, loading the crushed mixed coal into a top-charging coke oven, and coking to obtain coke with DI15015 strength of more than or equal to 87.5%. According to the method, different types of coking coals are classified and blended according to two dimensions of the softening temperature and the solid-soft temperature interval of the coal source for coking, so that the high-temperature plasticity of the blended coals meets the requirement of solidifying into coke with certain strength, the DI15015 strength of the coke is ensured to be greater than or equal to 87.5%, and the requirement of low-consumption stable operation of a blast furnace on the coke at low cost is met.

Description

Technical Field

[0001] This invention relates to the field of coking coal blending technology, and more specifically, to a method for controlling the dilution (DI) of coke. 150 15 Coal blending methods based on strength. Background Technology

[0002] Coke plays four roles in blast furnaces: heating, reducing agent, structural support, and carbon supply. While the heating, reducing agent, and carbon supply functions can be partially replaced, the role of providing a loose structural support for the blast furnace burden cannot be replaced. Moreover, with the increasing size of blast furnaces and the intensification of smelting processes, this role becomes even more crucial. Coke quality has a significant impact on the blast furnace smelting process; coke of a certain strength is a necessary condition for the stable and low-consumption operation of the blast furnace. Among these, coke dilution (DI)... 150 15 Strength characterizes the abrasion resistance and shatter resistance of coke, and is a key indicator for coking production control.

[0003] In recent years, the steel industry has faced significant cost pressures, and coking production needs to reduce coal blending costs to the lowest possible level. This has forced companies to purchase large quantities of economical coal sources for coking. In addition, the coking coal market is characterized by a wide variety of coal sources and serious coal blending issues. As a result, under the current low-cost coal blending situation, coke quality fluctuates frequently, making it impossible to ensure coke quality.

[0004] In the prior art, Chinese patent application CN201910535103.0 discloses a method for producing coke using waste activated carbon and coking. This technology reduces the impact on coke quality by controlling the particle size and proportion of waste activated carbon, resulting in a post-reaction coke strength (CSR) of 65%–70% and a drum strength (DI) of [missing information]. 15 The coke ash content is 86%–88%, and the ash content (Ad) is 11.8%–12%, ensuring that the coke meets the requirements for blast furnace ironmaking. This technology mainly solves the technical problem of difficulty in obtaining high-strength coke when adding waste activated carbon to the coal for coking in top-charged coke ovens in existing technologies.

[0005] Chinese patent application CN201710491089.X discloses a coke and coking method using Australian low-caking coking coal. The coke using Australian low-caking coking coal is produced by blending the following coals in the following mass percentages: 1 / 3 coking coal 15%–20%, gas coal 15%–20%, fat coal 22%–27%, coking coal 25%–35%, lean coal 4%–8%, and Australian low-caking coking coal 4%–10%. The coke has a drum strength (DI) ≥ 87%, a post-reaction strength (CSR) ≥ 66%, and meets the requirements of 4000m... 3This technology addresses the needs of blast furnace smelting at and above the required level. It primarily solves the technical problems of low drum strength (DI) and low post-reaction strength (CSR) of coke produced from Australian low-caking coking coal, which fail to meet the quality requirements of high-quality metallurgical coke in existing technologies.

[0006] Chinese patent application CN200980136164.4 discloses coke and a method for manufacturing the same. The method comprises: a step of obtaining blended coke by blending at least two of the following: a first coal with a volatile matter content of less than 30%; a second coal with a volatile matter content of 30% or more and a total expansion rate of 60% or more; a third coal with a volatile matter content of 30% to 42% and a total expansion rate of less than 60%; and a fourth coal with a volatile matter content of greater than 42% and a total expansion rate of less than 60%; and a step of dry distilling the blended coke. In the step of obtaining the blended coke, the total proportion of the second and third coals in the blended coke is set to 80% by mass or more, the proportion of the second coal in the blended coke is set to 20% by mass or more, the proportion of the fourth coal in the blended coke is set to 5% by mass or less, and the remaining portion of the blended coke is set to the first coal.

[0007] The paper "Strength Analysis of Coke Drum in 70kg Simulated Coke Oven" by Xia Hongbo et al. briefly describes the test conditions of a 70kg simulated coke oven and analyzes the strength of the coke drum (DI). 150 15 Analysis of influencing factors revealed that the metamorphic index (dry ash-free volatile matter or random average reflectance of vitrinite), inert matter content, and caking index of a single type of coal are the factors affecting DI. 150 15 The main factors were identified; through multi-parameter regression analysis, a predictive model for the drum strength of coke produced by single-type coal coking was derived.

[0008] According to the literature "Coke Strength and Particle Size under SCOPE21 Coking Process" by Ma Xiao et al., based on the results of the actual-scale semi-industrial test operation of SCOPE21, the following conclusions were drawn: (1) In the SCOPE21 process, under the condition of using 50% weakly caking coal (C coal) in the blend, DI 150 15 This process improves upon existing technology by 2.5 percentage points and can produce the target DI. 150 15 (2) Make DI 150 15The specific effects of the improvement are: rapid preheating of coal can increase it by 0.9 percentage points; increasing the bulk density can increase it by 1.0 percentage point; other effects (such as coke structure homogenization) can increase it by 0.6 percentage points. (3) Under the conditions of the highest production rate of SCOPE21 process (furnace temperature 1250℃), the addition of anthracite can increase the average particle size of coke by 3-5mm, and can produce coke with an average particle size of more than 43mm.

[0009] The paper "Prediction of Coke Strength and Coal Quality Control in Baosteel Blending" by Hu Desheng et al. uses the TI, CCI, and Vd of coal to control coking coal blending and predict the DI of coke. 150 15 CRI and CSR are relatively reliable. TI expresses the total inert content of coal, including ash, sulfur, and organic inert matter. The comprehensive caking index (CCI) is calculated using three parameters: G, logMF, and VCI, to express the characteristics of active substances in coking coal blends. The vitrinite caking index (VCI) is calculated based on the vitrinite reflectance distribution of coal. It can adequately express coal petrographic characteristics and accurately represent the difference between blended coals and single-type coals. However, this parameter also has limitations; it cannot sensitively reflect the effect of oxidation on coal caking properties.

[0010] Zhang Qun et al.'s paper, "Baosteel Coke Quality Prediction Model," conducted SCO furnace coking tests on 19 single coal types and 64 blended coal types. The selected single coal types were the main and typical coal types used by Baosteel, with an average random reflectance (R) of 0.55%–1.98%, inert matter content (Ti) of 24.9%–47.0%, and Gibbs freeness (MF) of 0–>37000 DDPM. The range of coal properties selected for model establishment was relatively wide. The model parameters and their weights indicate the influencing factors on coke quality and their magnitude. The factors determining coke ash and sulfur content are the ash, sulfur, and volatile matter of each single coal type involved in the blend, respectively, while the factors determining coke cold strength (DI) are... 150 15 The main factors affecting the caking properties of coal are its volatile matter, caking properties, and inert matter content (including organic and inorganic inert matter). The main factors influencing coke reactivity (CRI) are the coal's mineral catalytic index, random reflectance, Gibbs freeness, inert matter content, and briquette ratio. Similarly, the main factors affecting coke post-reaction strength (CSR) are the coal's mineral catalytic index, volatile matter, Gibbs freeness, inert matter content, and briquette ratio. In fact, the interactions between various coal properties and their impact on coke quality are very complex. While it is generally believed that coal caking properties are closely related to coke properties, the minerals in coal also have a significant impact on coke properties.

[0011] The foreign literature "The Effect of Coal Tar Addition on Coke Quality" analyzed the effect of coal tar addition on coke quality. The experiment was conducted in a 150kg test coke oven, with coal tar addition amounts of 2% and 5%. The results showed that coal tar, as an additive, can improve the coking performance of blended coal, increasing coke reaction strength (CSR), reactivity (CRI), drum index (DI), and fluidity. It also suggests that lower-priced, less coking semi-soft coking coal with poorer coking performance can be incorporated into blended coal, thereby reducing coking costs.

[0012] The paper "Relationship between Pore Structure Parameters and Coke Cold and Hot Strength" by Xia Hongbo et al. compared the differences in the regression equations for coke cold strength, post-reaction strength, and reactivity. Cold strength is only related to pore structure parameters; while post-reaction strength and reactivity are related not only to pore structure parameters but also to the coal ash catalytic index, with a negative correlation between CSR and MCI, and a positive correlation between CRI and MCI.

[0013] In the foreign literature "The Influence of Pore Structure on the Surface Fracture Strength and Tensile Strength of Coke", DI is commonly used for coke strength management. 150 15 and TI 400 The cold-state drum strength index (DI) is often used to directly estimate the cold-state strength of coke based on coal properties such as coalification degree and flowability. However, some studies have proposed estimating coke strength through its structure and characteristics. Besides being influenced by matrix strength, the cold-state strength of coke is also affected by microcracks and porosity. 150 15 Coke pulverization is divided into surface breakage and volume breakage. The cause of surface breakage of coke is non-adhesive crystal boundaries and connecting pores. Therefore, the porosity and pore size of coke have a significant impact on the cold-state pulverization behavior and drum strength of coke.

[0014] In summary, the aforementioned existing technologies use parameters such as the metamorphic degree index of a single type of coal (dry ash-free volatile matter or random average reflectance of vitrinite), the inert matter content and caking index of the coal, logMF, the vitrinite reflectance distribution of the coal, and the porosity and pore size of the coke to predict DI. 150 15 However, these coal quality indicators cannot be directly correlated with the chemical reactions in the coking process, thus limiting the control of coke strength. Summary of the Invention

[0015] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for controlling the dilution of coke. 150 15The strength-based coal blending method classifies and blends different types of coking coal based on two dimensions: the softening temperature and the solid-softening temperature range of the coal source. This ensures that the high-temperature plasticity of the blended coal meets the requirements for solidification into coke of a certain strength, thus guaranteeing the dilution ratio (DI) of the coke. 150 15 With a strength ≥87.5%, it meets the requirements for coke under low-cost, low-consumption, and stable operation of blast furnaces.

[0016] To achieve the above objectives, the present invention adopts the following technical solution:

[0017] A method for controlling coke DI 150 15 The method for blending coal with high strength includes the following steps:

[0018] S1, determine the softening temperature and solid-softening temperature range of coking coal sources, and classify the coal sources accordingly;

[0019] S2, blended coal is obtained by proportioning according to the classification of coal sources;

[0020] S3, after being crushed, will be fed into a top-charged coke oven for coking to obtain DI. 150 15 Coke with a strength of ≥87.5%.

[0021] Preferably, in step S1, the method for determining the softening temperature and solid-soft temperature range of the coking coal source is the constant torque Gibbs plasticity tester method.

[0022] Preferably, in step S1, the coal sources are classified as follows:

[0023] S11, coal sources with a softening temperature ≤380℃, are classified as No. 1 coal;

[0024] S12, under softening temperature conditions of 381℃~405℃:

[0025] Coal sources with a solid-soft temperature range ≥100℃ are classified as 2-1# coal; coal sources with a solid-soft temperature range of 90℃~99℃ are classified as 2-2# coal; coal sources with a solid-soft temperature range of 80℃~89℃ are classified as 2-3# coal; and coal sources with a solid-soft temperature range <80℃ are classified as 2-4# coal.

[0026] S13, under softening temperature conditions of 406℃~425℃:

[0027] Coal sources with a solid-soft temperature range ≥100℃ are classified as 3-1# coal; coal sources with a solid-soft temperature range of 90℃~99℃ are classified as 3-2# ​​coal; coal sources with a solid-soft temperature range of 80℃~89℃ are classified as 3-3# coal; coal sources with a solid-soft temperature range of 70℃~79℃ are classified as 3-4# coal; and coal sources with a solid-soft temperature range <70℃ are classified as 3-5# coal.

[0028] S14, under softening temperature conditions of 426℃~450℃:

[0029] Coal sources with a solid-soft temperature range ≥80℃ are classified as 4-1# coal; coal sources with a solid-soft temperature range of 70℃~79℃ are classified as 4-2# coal; coal sources with a solid-soft temperature range of 60℃~69℃ are classified as 4-3# coal; and coal sources with a solid-soft temperature range <60℃ are classified as 4-4# coal.

[0030] S15, a coal source with a softening temperature of 451℃~470℃, is classified as No. 5 coal.

[0031] S16, a coal source that does not soften or melt, is classified as No. 6 coal.

[0032] Preferably, in step S2, the method for proportioning according to the classification of coal sources is as follows:

[0033] The proportion of No. 1 coal is ≤10%;

[0034] The sum of the proportions of 2-1# coal, 2-2# coal, 2-3# coal and 2-4# coal is 10-30%;

[0035] The sum of the proportions of 3-1# coal, 3-2# ​​coal, 3-3# coal, 3-4# coal and 3-5# coal is 10% to 30%.

[0036] The sum of the proportions of 4-1# coal, 4-2# coal, 4-3# coal and 4-4# coal is 10-30%;

[0037] The proportion of No. 5 coal should be ≤10%;

[0038] The proportion of No. 6 coal is ≤8%.

[0039] Preferably, the sum of the proportions of 2-1# coal, 3-1# coal and 4-1# coal is 10-20%;

[0040] The sum of the proportions of the 2-2# coal, 3-2# ​​coal and 4-2# coal is 10-25%;

[0041] The sum of the proportions of No. 2-3 coal, No. 3-3 coal, and No. 4-3 coal is 10-30%.

[0042] The sum of the proportions of No. 2-4 coal, No. 3-5 coal, and No. 4-4 coal is 10-30%.

[0043] The sum of the proportions of No. 3-4 coal and No. 5 coal is 10-15%.

[0044] Preferably, in step S3, the proportion of the blended coal crushed to a particle size of less than 3 mm is ≥76%;

[0045] The top-loading coke oven is a top-loading coke oven with a length of 6 meters or more;

[0046] During the coking process, the standard furnace temperature is 1285–1305℃, and the coking time is 19–27 hours.

[0047] The present invention provides a method for controlling the dilution of coke. 150 15 The high-intensity coal blending method has the following beneficial effects:

[0048] 1. This invention can obtain the softening temperature and solid-softening temperature range of coking coal by measuring the softening temperature and solid-softening temperature range, and classify the coal source according to the measured softening temperature and solid-softening temperature range. The classification index is directly related to the chemical reaction in the coking process, and avoids the shortcomings of the national standard classification method in terms of poor identification ability of caking index G value and plastic layer index Y value for mixed coal. It can more accurately characterize the coking properties of coking coal and can more effectively control the strength of coke.

[0049] 2. This invention limits the proportion of different types of coking coal from two dimensions: softening temperature and solid-softening temperature range, so that the high-temperature plasticity of the blended coal meets the requirements for solidification into coke of a certain strength; moreover, various types of coal can be substituted for each other, and the resource allocation is highly flexible. Users can choose to purchase and use low-priced coal sources for coking according to market conditions.

[0050] 3. This invention is based on the fact that softening temperature and the solid-softening temperature range are essential characteristic indicators of coal, and they have high practicality and universality for coal sources. Coal blending and coking according to the method of this invention can accurately control the DI of coke. 150 15 strength. Detailed Implementation

[0051] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with embodiments.

[0052] This invention provides a method for controlling the dilution of coke. 150 15The strength-based coal blending method, while using a high proportion of economical coal sources, limits the proportion of different types of coking coal from two dimensions: softening temperature and solid-softening temperature range. This ensures that the high-temperature plasticity of the blended coal meets the requirements for solidification into coke of a certain strength, enabling the production of DI (diluted coke) in top-charged coke ovens of 6 meters and above. 150 15 Coke with a strength of ≥87.5% meets the requirements for stable operation of blast furnaces with low cost and low consumption under low cost conditions.

[0053] This invention provides a method for controlling the dilution of coke. 150 15 The method for blending coal with high strength includes the following steps:

[0054] S1, determine the softening temperature and solid-softening temperature range of coking coal sources, and classify the coal sources accordingly;

[0055] The softening temperature and solid-softening temperature range of coking coal sources were determined according to the constant torque Gibbs plasticity tester method in ASTM D2639 / D2639M-16 standard, and the coal sources were classified accordingly.

[0056] The above-mentioned coal sources for coking are classified as follows:

[0057] S11, coal sources with a softening temperature ≤380℃, are classified as No. 1 coal;

[0058] S12, under softening temperature conditions of 381℃~405℃:

[0059] Coal sources with a solid-soft temperature range ≥100℃ are classified as 2-1# coal; coal sources with a solid-soft temperature range of 90℃~99℃ are classified as 2-2# coal; coal sources with a solid-soft temperature range of 80℃~89℃ are classified as 2-3# coal; and coal sources with a solid-soft temperature range <80℃ are classified as 2-4# coal.

[0060] S13, under softening temperature conditions of 406℃~425℃:

[0061] Coal sources with a solid-soft temperature range ≥100℃ are classified as 3-1# coal; coal sources with a solid-soft temperature range of 90℃~99℃ are classified as 3-2# ​​coal; coal sources with a solid-soft temperature range of 80℃~89℃ are classified as 3-3# coal; coal sources with a solid-soft temperature range of 70℃~79℃ are classified as 3-4# coal; and coal sources with a solid-soft temperature range <70℃ are classified as 3-5# coal.

[0062] S14, under softening temperature conditions of 426℃~450℃:

[0063] Coal sources with a solid-soft temperature range ≥80℃ are classified as 4-1# coal; coal sources with a solid-soft temperature range of 70℃~79℃ are classified as 4-2# coal; coal sources with a solid-soft temperature range of 60℃~69℃ are classified as 4-3# coal; and coal sources with a solid-soft temperature range <60℃ are classified as 4-4# coal.

[0064] S15, a coal source with a softening temperature of 451℃~470℃, is classified as No. 5 coal.

[0065] S16, a coal source that does not soften or melt, is classified as No. 6 coal.

[0066] S2, blended coal is obtained by proportioning according to the classification of coal sources;

[0067] The blending ratios of different types of coking coal are limited based on two dimensions: softening temperature and solid-softening temperature range, ensuring that the high-temperature plasticity of the blended coal meets the requirements for solidification into coke of a certain strength. The method for blending based on coal source classification is as follows:

[0068] The proportion of No. 1 coal is ≤10%;

[0069] The sum of the proportions of 2-1# coal, 2-2# coal, 2-3# coal and 2-4# coal is 10-30%;

[0070] The sum of the proportions of 3-1# coal, 3-2# ​​coal, 3-3# coal, 3-4# coal and 3-5# coal is 10% to 30%.

[0071] The sum of the proportions of 4-1# coal, 4-2# coal, 4-3# coal and 4-4# coal is 10-30%;

[0072] The proportion of No. 5 coal should be ≤10%;

[0073] The proportion of No. 6 coal is ≤8%.

[0074] In the above proportions, the sum of the proportions of 2-1# coal, 3-1# coal and 4-1# coal is 10-20%;

[0075] The combined proportions of No. 2-2 coal, No. 3-2 coal, and No. 4-2 coal are 10-25%.

[0076] The combined proportions of No. 2-3 coal, No. 3-3 coal, and No. 4-3 coal are 10-30%.

[0077] The combined proportions of No. 2-4 coal, No. 3-5 coal, and No. 4-4 coal are 10-30%.

[0078] The combined proportion of No. 3-4 coal and No. 5 coal is 10-15%.

[0079] S3, after being crushed, will be fed into a top-charged coke oven for coking to obtain DI.150 15 Coke with a strength of ≥87.5%.

[0080] After the blended coal is crushed to a suitable particle size, it is charged into a top-charged coke oven of 6 meters or more, and coking is carried out according to the thermal regime set for different coke oven types to obtain DI. 150 15 Coke with a strength of ≥87.5%.

[0081] In a specific embodiment, the proportion of coal crushed to a particle size of less than 3mm is ≥76%; during the coking process, the standard furnace temperature is 1285~1305℃, and the coking time is 19~27h.

[0082] Example 1

[0083] This embodiment provides a method for controlling coke DI suitable for a 7-meter top-loading coke oven. 150 15 A high-intensity coal blending and coking method, and its integration with actual coking coal blending production, includes the following steps:

[0084] (1) The softening temperature and solid-soft temperature range of coking coal can be obtained by constant torque Gibbs plasticity tester method in ASTM D2639 / D2639M–16 (see Table 1).

[0085] (2) The coal sources are classified according to the measured softening temperature and solid-soft temperature range (see Table 1);

[0086] (3) The proportions of different types of coking coal are limited from two dimensions: softening temperature and solid-soft temperature range (see Table 1).

[0087] (4) After crushing the blended coal to a particle size of less than 3mm with a coal content of 78%, it is loaded into a 7-meter top-charged coke oven. The standard oven temperature is 1290℃, the coking time is 24 hours, and the coke is cooled by dry quenching to obtain coke DI. 150 15 Strength: 88.0%

[0088] Table 1

[0089]

[0090] Example 2

[0091] This example provides a method for controlling coke DI (dimethyl precipitate) in a 6-meter top-loading coke oven. 150 15 A high-intensity coal blending and coking method, and its integration with actual coking coal blending production, includes the following steps:

[0092] (1) The softening temperature and solid-soft temperature range of coking coal can be obtained by constant torque Gibbs plasticity tester method in ASTM D2639 / D2639M–16 (see Table 2).

[0093] (2) The coal sources are classified according to the measured softening temperature and solid-soft temperature range (see Table 2);

[0094] (3) The proportions of different types of coking coal are limited from two dimensions: softening temperature and solid-soft temperature range (see Table 2).

[0095] (4) After crushing the blended coal to a particle size of less than 3mm with a coal content of 77%, it is loaded into a 6-meter top-loading coke oven. The standard oven temperature is 1285℃, the coking time is 19 hours, and the coke is cooled by dry quenching to obtain coke DI. 150 15 Strength: 87.7%.

[0096] Table 2

[0097]

[0098] Example 3

[0099] This example provides a method for controlling coke DI in a 7.63-meter top-charged coke oven. 150 15 A high-intensity coal blending and coking method, and its integration with actual coking coal blending production, includes the following steps:

[0100] (1) The softening temperature and solid-soft temperature range of coking coal can be obtained by constant torque Gibbs plasticity tester method in ASTM D2639 / D2639M–16 (see Table 3).

[0101] (2) The coal sources are classified according to the measured softening temperature and solid-soft temperature range (see Table 3);

[0102] (3) The proportions of different types of coking coal are limited from two dimensions: softening temperature and solid-soft temperature range (see Table 3).

[0103] (4) After crushing the blended coal to a particle size of less than 3mm with a coal content of 76%, it is charged into a 7.63-meter top-charged coke oven at a standard oven temperature of 1305℃ and a coking time of 27 hours. The coke is then quenched in a dry oven to obtain coke DI. 150 15 Strength: 88.1%

[0104] Table 3

[0105]

[0106] Example 4

[0107] This example provides a method for controlling coke DI (dimethyl precipitate) in a 7-meter top-loading coke oven. 150 15 A high-intensity coal blending and coking method, and its integration with actual coking coal blending production, includes the following steps:

[0108] (1) The softening temperature and solid-soft temperature range of coking coal can be obtained by constant torque Gibbs plasticity tester method in ASTM D2639 / D2639M–16 (see Table 4).

[0109] (2) The coal sources are classified according to the measured softening temperature and solid-soft temperature range (see Table 4);

[0110] (3) The proportions of different types of coking coal are limited from two dimensions: softening temperature and solid-soft temperature range (see Table 4).

[0111] (4) After crushing the blended coal to a particle size of less than 3mm with a coal content of 77%, it is loaded into a 7-meter top-charged coke oven. The standard oven temperature is 1290℃, the coking time is 24 hours, and the coke is cooled by dry quenching to obtain coke DI. 150 15 Strength: 87.9%.

[0112] Table 4

[0113]

[0114] Example 5

[0115] This example provides a method for controlling coke DI (dimethyl precipitate) in a 6-meter top-loading coke oven. 150 15 A high-intensity coal blending and coking method, and its integration with actual coking coal blending production, includes the following steps:

[0116] (1) The softening temperature and solid-soft temperature range of coking coal can be obtained by constant torque Gibbs plasticity tester method in ASTM D2639 / D2639M–16 (see Table 5).

[0117] (2) The coal sources are classified according to the measured softening temperature and solid-soft temperature range (see Table 5).

[0118] (3) The proportions of different types of coking coal are limited from two dimensions: softening temperature and solid-soft temperature range (see Table 5).

[0119] (4) After crushing the blended coal to a particle size of less than 3mm with a coal content of 78%, it is loaded into a 6-meter top-charged coke oven. The standard oven temperature is 1285℃, the coking time is 19 hours, and the coke is cooled by dry quenching to obtain coke DI. 150 15Strength: 88.0%

[0120] Table 5

[0121]

[0122] Example 6

[0123] This example provides a method for controlling coke DI in a 7.63-meter top-charged coke oven. 150 15 A high-intensity coal blending and coking method, and its integration with actual coking coal blending production, includes the following steps:

[0124] (1) The softening temperature and solid-soft temperature range of coking coal can be obtained by constant torque Gibbs plasticity tester method in ASTM D2639 / D2639M–16 (see Table 5).

[0125] (2) The coal sources are classified according to the measured softening temperature and solid-soft temperature range (see Table 5).

[0126] (3) The proportions of different types of coking coal are limited from two dimensions: softening temperature and solid-soft temperature range (see Table 5).

[0127] (4) After crushing the blended coal to a particle size of less than 3mm with a coal content of 78%, it is charged into a 7.63-meter top-charged coke oven at a standard oven temperature of 1305℃ and a coking time of 27 hours. The coke is then quenched in a dry oven to obtain coke DI. 150 15 Strength: 88.2%.

[0128] Table 5

[0129]

[0130]

[0131] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A method for controlling the dilution of coke 150 15 The method for blending coal with high strength is characterized by, Includes the following steps: S1, determine the softening temperature and solid-softening temperature range of coking coal sources, and classify the coal sources accordingly; S2, blended coal is obtained by proportioning according to the classification of coal sources; S3, after being crushed, will be fed into a top-charged coke oven for coking to obtain DI. 150 15 Coke with a strength of ≥87.5%.

2. The method for controlling coke DI according to claim 1 150 15 The method for blending coal with high strength is characterized by: In step S1, the method for determining the softening temperature and solid-softening temperature range of the coking coal source is the constant torque Gibbs plasticity tester method.

3. The method for controlling coke DI according to claim 1 150 15 The method for blending coal with high strength is characterized by: In step S1, the coal sources are classified as follows: S11, coal sources with a softening temperature ≤380℃, are classified as No. 1 coal; S12, under softening temperature conditions of 381℃~405℃: Coal sources with a solid-soft temperature range ≥100℃ are classified as 2-1# coal; coal sources with a solid-soft temperature range of 90℃~99℃ are classified as 2-2# coal; coal sources with a solid-soft temperature range of 80℃~89℃ are classified as 2-3# coal; and coal sources with a solid-soft temperature range <80℃ are classified as 2-4# coal. S13, under softening temperature conditions of 406℃~425℃: Coal sources with a solid-soft temperature range ≥100℃ are classified as 3-1# coal; coal sources with a solid-soft temperature range of 90℃~99℃ are classified as 3-2# ​​coal; coal sources with a solid-soft temperature range of 80℃~89℃ are classified as 3-3# coal; coal sources with a solid-soft temperature range of 70℃~79℃ are classified as 3-4# coal; and coal sources with a solid-soft temperature range <70℃ are classified as 3-5# coal. S14, under softening temperature conditions of 426℃~450℃: Coal sources with a solid-soft temperature range ≥80℃ are classified as 4-1# coal; coal sources with a solid-soft temperature range of 70℃~79℃ are classified as 4-2# coal; coal sources with a solid-soft temperature range of 60℃~69℃ are classified as 4-3# coal; and coal sources with a solid-soft temperature range <60℃ are classified as 4-4# coal. S15, a coal source with a softening temperature of 451℃~470℃, is classified as No. 5 coal. S16, a coal source that does not soften or melt, is classified as No. 6 coal.

4. The method for controlling coke DI according to claim 3 150 15 The method for blending coal with high strength is characterized by: In step S2, the method for proportioning coal according to its source is as follows: The proportion of No. 1 coal is ≤10%; The sum of the proportions of 2-1# coal, 2-2# coal, 2-3# coal and 2-4# coal is 10-30%; The sum of the proportions of 3-1# coal, 3-2# ​​coal, 3-3# coal, 3-4# coal and 3-5# coal is 10% to 30%. The sum of the proportions of 4-1# coal, 4-2# coal, 4-3# coal and 4-4# coal is 10-30%; The proportion of No. 5 coal should be ≤10%; The proportion of No. 6 coal is ≤8%.

5. The method for controlling coke DI according to claim 4 150 15 The method for blending coal with high strength is characterized by: The sum of the proportions of the 2-1# coal, 3-1# coal and 4-1# coal is 10-20%; The sum of the proportions of the 2-2# coal, 3-2# ​​coal and 4-2# coal is 10-25%; The sum of the proportions of No. 2-3 coal, No. 3-3 coal, and No. 4-3 coal is 10-30%. The sum of the proportions of No. 2-4 coal, No. 3-5 coal, and No. 4-4 coal is 10-30%. The sum of the proportions of No. 3-4 coal and No. 5 coal is 10-15%.

6. The method for controlling coke DI according to claim 1 150 15 The method for blending coal with high strength is characterized by: In step S3, the proportion of the blended coal crushed to a particle size of less than 3 mm is ≥76%. The top-loading coke oven is a top-loading coke oven with a length of 6 meters or more; During the coking process, the standard furnace temperature is 1285–1305℃, and the coking time is 19–27 hours.

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