Methods for adapting to the spatial distribution of coal storage in complex coal silos

Abstract

This invention relates to a method for adapting to the spatial distribution of coal storage in complex coal silos. This method combines "basic coal types + auxiliary coal types + cost-reducing coal types" and implements a two-system approach for coal types with limited resources. This overcomes the problems of large fluctuations in coal blending and coke quality in open-pit coal yards, and basically achieves coal blending based on the mine location, which is conducive to stable control of blending and coke quality. In addition, the degree of freedom in coal blending is greatly improved, from the original 9-10 subdivided coal types in open-pit coal yards to more than 15 coal types, which greatly improves the use of low-priced coal types and achieves a significant reduction in coal blending costs.

Description

Technical Field

[0001] This invention relates to the field of coal blending and coking technology, and in particular to a method for adapting to the spatial distribution of coal storage in complex coal source silos. Background Technology

[0002] The revised "Access Conditions for the Coking Industry" in 2014 clearly stipulates that "coking enterprises should simultaneously equip themselves with enclosed coal storage facilities as well as dust suppression and removal facilities such as coal transfer, coal crushing, coal loading, coke pushing, coke quenching, coke screening, and ammonium sulfate drying." In accordance with these explicit requirements, major steel companies across the country have been enclosing and renovating their existing open-air coal yards, implementing silo coal storage technology.

[0003] However, coking coal resources are becoming increasingly complex. Due to cost control constraints in coal blending, the subcategories of coking coal are increasing. Because the number of silos for coal storage is limited, the types of coal that can be blended are restricted. In particular, some steel companies have different coke oven types (6-meter, 7-meter, and 7.63-meter), resulting in different coal blending schemes and coal usage. Since silos lack a mixing function, if open-air coal yard storage methods are continued, the quality of blended coal and coke will fluctuate even more. Therefore, there is an urgent need to develop a scientific and reasonable spatial distribution method for silo coal storage, which can essentially achieve coal blending based on the mining site, maximize the use of low-priced coal types, reduce blending costs, and ensure stable control of blended coal quality with minimal fluctuations in coke quality. Summary of the Invention

[0004] To address the above issues, this invention provides a method for adapting to the spatial distribution of coal in complex coal silos, maximizing the use of low-priced coal types, reducing coal blending costs, ensuring stable control of coal blending quality, minimizing coke quality fluctuations, and significantly ensuring stable blast furnace production and smooth operation.

[0005] The technical solution adopted in this invention is: a method for adapting to the spatial distribution of coal storage in complex coal source silos, characterized by the following steps:

[0006] S1. Subdivision of complex coal sources and coal quality: Subdividing complex coal sources according to volatile matter, sulfur content, G value and coking microstructure;

[0007] S2. Functional Classification of Complex Coal Sources: Complex coal sources are classified into basic coal types, auxiliary coal types, and cost-reduction coal types according to their functions. Among them, basic coal types are the coal types that must be selected for each coal blending scheme; auxiliary coal types are those with unstable resources, which are sometimes available and sometimes unavailable, and whose resource quantity cannot meet the needs of coke ovens of different types; cost-reduction coal types are those with low prices used for cost reduction.

[0008] S3. Spatial distribution rules: Each row of silos should first meet the needs of 8 basic coal types. Cost-reducing coal types and auxiliary coal types should be used in two systems per silo.

[0009] By combining "basic coal types + auxiliary coal types + cost-reducing coal types", and implementing a two-system approach for coal types with limited resources, the problem of large fluctuations in coal blending and coke quality caused by open-pit coal storage is overcome. Coal blending is basically achieved according to the mine site, which is conducive to stable control of blending quality and coke quality.

[0010] As a preferred option, the number of silos is between 33 and 35, and each silo has four feeding ports. The coke oven types are 6 meters, 7 meters and 7.63 meters, and the coke output of the three types is similar, so as to realize coal blending according to the mine site.

[0011] As a preferred embodiment, step S1 specifically involves:

[0012] Coking coal is categorized into six types based on sulfur content and microstructure.

[0013] Low-sulfur high-quality coking coal is designated as Coking Coal 1#: sulfur content <= 1.0%, coarse particle size distribution in coking coal ≥ 60%; High-sulfur high-quality coking coal is designated as Coking Coal 1A: 1.8% ≤ sulfur content ≤ 2.2%, coarse particle size distribution in coking coal ≥ 60%; Medium-sulfur high-quality coking coal is designated as Coking Coal 2#: 1.0% < sulfur content < 1.8%, coarse particle size distribution in coking coal ≥ 60%; Medium-sulfur general-quality coking coal is designated as Coking Coal 2A: 1.0% < sulfur content < 1.8%, 50% ≤ coarse particle size distribution in coking coal < 60%; High-sulfur general-quality coking coal is designated as Coking Coal 3#: 1.8% ≤ sulfur content ≤ 2.3%, 50% ≤ coarse particle size distribution in coking coal < 60%; Imported coking coal: sulfur content <= 1.0%, coarse particle size distribution in coking coal ≥ 50%;

[0014] Coal in coking coal is classified into three categories: volatile matter, sulfur content, and Y value.

[0015] Low-sulfur coking coal is designated as Coking Coal 1#: volatile matter (Vdaf) ≤ 33%, Y value > 25 mm, sulfur content <= 1.0%; medium-sulfur coking coal is designated as Coking Coal 2#: volatile matter (Vdaf) ≤ 33%, Y value > 25 mm, 1.0% < sulfur content < 1.8%; high-sulfur coking coal is designated as Coking Coal 3#: volatile matter (Vdaf) ≤ 33%, Y value > 25 mm, 1.8% ≤ sulfur content ≤ 2.3%.

[0016] 1 / 3 coking coal is classified into three categories: volatile matter, sulfur content, microstructure, and Y value.

[0017] Low-sulfur, high-quality 1 / 3 coking coal is designated as 1 / 3 coking coal #1: volatile matter (Vdaf) ≤ 33%, sulfur content <= 1.0%, and coarse-grained interlocking of single-type coal coking coal ≥ 30%; low-sulfur, high-volatile matter, high-fluidity 1 / 3 coking coal is designated as 1 / 3 coking coal #2: volatile matter (Vdaf) > 33%, G value > 85, sulfur content <= 1.0%, and Y value ≥ 22mm; low-sulfur, general-quality, medium-volatile matter 1 / 3 coking coal is designated as 1 / 3 coking coal #3: volatile matter (Vdaf) ≤ 33%, sulfur content <= 1.0%, and coarse-grained interlocking of single-type coal coking coal < 30%.

[0018] Gas coal is classified into two categories: volatile matter, sulfur content, microstructure, and Y value.

[0019] High-G value gas coal is designated as Gas Coal 1#: volatile matter (Vdaf) > 36%, G value > 80, and isotropic content < 5%; low-G value gas coal is designated as Gas Coal 2#: volatile matter (Vdaf) > 36%, G value 60–80, and isotropic content > 5%.

[0020] Lean coal is classified into three categories: volatile matter, sulfur content, and gamma value.

[0021] Low-sulfur lean coal is designated as Lean Coal 1#: volatile matter (Vdaf) > 10%–20%, G value 20–65, 1.0% ≤ sulfur content ≤ 2.5%; high-sulfur lean coal is designated as Lean Coal 2#: volatile matter (Vdaf) > 10%–20%, G value 30–65, sulfur content 1.0%; lean coal is designated as Lean Coal: volatile matter (Vdaf) > 10%–20%, G value 5–20.

[0022] As a preferred option, in step S2, the basic coal types are: coking coal 1#, coking coal 1A, coking coal 2#, fat coal 1#, 1 / 3 coking coal 1#, 1 / 3 coking coal 2#, gas coal 1#, and lean coal 1#; the auxiliary coal types are: imported coking coal, fat coal 2#, and 1 / 3 coking coal 3#; and the cost-reducing coal types are: coking coal 2A, fat coal 3#, lean coal 2#, semi-lean coal, gas coal 2#, and coking coal 3#.

[0023] As a preferred option, step S3 specifically involves the following steps:

[0024] S31. Coke ovens come in three types: 7 meters, 6 meters, and 7.63 meters. The 6-meter coke oven uses coal with a 1-stage coal system, the 7-meter coke oven uses coal with a 2-stage coal system, and the 7.63-meter coke oven uses coal with a 3-stage coal system. The silos are arranged in three rows to supply the three coal systems, with 11 silos in each row, for a total of 33 silos. (Each row of silos corresponds to one coal system.)

[0025] S32. Each row of silos should first meet the needs of 8 basic coal types, with each row occupying 7 silos, requiring a total of 21 silos. If the single proportion of gas coal #1 and lean coal #1 in a certain blending system is higher than 8%, then gas coal #1 and lean coal #1 each need to occupy 1 silo, occupying a total of 2 silos. That is, the basic coal types of this blending system need to occupy 8 silos.

[0026] S33. Each row has 3-4 remaining silos, totaling 9-12 silos for auxiliary and cost-reduction coal types. Both cost-reduction and auxiliary coal types are allocated using a shared system of two systems per silo. (With 3-4 remaining silos per row, totaling 9-12 silos using a shared system of two systems per silo, this is equivalent to each row having 6-8 available auxiliary and cost-reduction coal types.)

[0027] As a preferred option, in step S33, in order to control the sulfur content of coke, only two coal types can be selected for the No. 1 blending system of high-sulfur coke, high-sulfur fat, and high-sulfur lean coal. That is, high-sulfur coke, high-sulfur lean coal, and high-sulfur fat can be used in a maximum of two blending systems, requiring a total of three silos.

[0028] As a preferred option, in step S33, gas coal #2 and lean coal are used as cost-reducing coal types, and all three systems are used. Gas coal #2 requires 2 silos and lean coal requires 2 silos, occupying a total of 4 silos.

[0029] Preferably, in step S33, the remaining silos are used for auxiliary coal types or for a large proportion of coal types.

[0030] As a preferred formulation, the following blend is used: Coking coal #1: 16-25%, Coking coal 1A: 8-14%, Coking coal #2: 8-14%, Fat coal #1: 8-12%, 1 / 3 coking coal #1: 7-15%, 1 / 3 coking coal #2: 5-15%, Gas coal #1: 5-10%, Lean coal #1: 7-14%, High-sulfur coke: 0-8%, High-sulfur lean: 0-8%; High-sulfur fat coal: 3-8%, Gas coal #2: 0-6%, Lean coal: 0-5%, Fat coal #3: 0-8%, Coking coal 2A: 0-5%, 1 / 3 coking coal #3: 0-5%, Imported coal: 0-5%.

[0031] As a preferred method, coking in top-loading coke ovens of 6 meters or more requires a dry-quenched coke CSR > 68% and an M40 > 88.5%.

[0032] The beneficial effects achieved by this invention are as follows: By combining "basic coal types + auxiliary coal types + cost-reducing coal types", and implementing a two-system approach for coal types with limited resources, the invention overcomes the problems of large fluctuations in coal blending and coke quality in open-pit coal storage, and basically achieves coal blending based on the mine location, which is conducive to stable control of blending quality and coke quality. In addition, the degree of freedom in coal blending is greatly improved, from the original 9-10 subdivided coal types in open-pit coal yards to more than 15 coal types, which greatly improves the use of low-priced coal types and achieves a significant reduction in coal blending costs. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides a method for adapting to the spatial distribution of coal storage in complex coal-producing silos. The number of silos is between 33 and 35, with each silo having four feeding ports. The coke ovens include three types: 6-meter, 7-meter, and 7.63-meter, with similar coke production capacities, achieving coal blending based on the specific mine location. The method specifically includes the following steps:

[0035] S1. Subdivision of complex coal sources and coal quality, commonly used coal types: low-sulfur high-quality coking coal, high-sulfur high-quality coking coal, medium-low sulfur general-quality coking coal, high-sulfur general-quality coking coal, imported coking coal; low-sulfur fat coal, medium-sulfur fat coal, high-sulfur fat coal; low-sulfur high-quality 1 / 3 coking coal, low-sulfur high-volatile matter high-flow 1 / 3 coking coal, low-sulfur low-volatile matter 1 / 3 coking coal; high-G value gas coal, low-G value gas coal; low-sulfur lean coal, high-sulfur lean coal, lean coal, etc.; complex coal sources are subdivided according to volatile matter, sulfur content, G value, and coking microstructure, with different indicators used for different coals;

[0036] Coking coal is categorized into six types based on sulfur content and microstructure.

[0037] Low-sulfur high-quality coking coal is designated as Coking Coal 1#: sulfur content <= 1.0%, coarse particle size distribution in coking coal ≥ 60%; High-sulfur high-quality coking coal is designated as Coking Coal 1A: 1.8% ≤ sulfur content ≤ 2.2%, coarse particle size distribution in coking coal ≥ 60%; Medium-sulfur high-quality coking coal is designated as Coking Coal 2#: 1.0% < sulfur content < 1.8%, coarse particle size distribution in coking coal ≥ 60%; Medium-sulfur general-quality coking coal is designated as Coking Coal 2A: 1.0% < sulfur content < 1.8%, 50% ≤ coarse particle size distribution in coking coal < 60%; High-sulfur general-quality coking coal is designated as Coking Coal 3#: 1.8% ≤ sulfur content ≤ 2.3%, 50% ≤ coarse particle size distribution in coking coal < 60%; Imported coking coal: sulfur content <= 1.0%, coarse particle size distribution in coking coal ≥ 50%;

[0038] Coal in coking coal is classified into three categories: volatile matter, sulfur content, and Y value.

[0039] Low-sulfur coking coal is designated as Coking Coal 1#: volatile matter (Vdaf) ≤ 33%, Y value > 25 mm, sulfur content <= 1.0%; medium-sulfur coking coal is designated as Coking Coal 2#: volatile matter (Vdaf) ≤ 33%, Y value > 25 mm, 1.0% < sulfur content < 1.8%; high-sulfur coking coal is designated as Coking Coal 3#: volatile matter (Vdaf) ≤ 33%, Y value > 25 mm, 1.8% ≤ sulfur content ≤ 2.3%.

[0040] 1 / 3 coking coal is classified into three categories: volatile matter, sulfur content, microstructure, and Y value.

[0041] Low-sulfur, high-quality 1 / 3 coking coal is designated as 1 / 3 coking coal #1: volatile matter (Vdaf) ≤ 33%, sulfur content <= 1.0%, and coarse-grained interlocking of single-type coal coking coal ≥ 30%; low-sulfur, high-volatile matter, high-fluidity 1 / 3 coking coal is designated as 1 / 3 coking coal #2: volatile matter (Vdaf) > 33%, G value > 85, sulfur content <= 1.0%, and Y value ≥ 22mm; low-sulfur, general-quality, medium-volatile matter 1 / 3 coking coal is designated as 1 / 3 coking coal #3: volatile matter (Vdaf) ≤ 33%, sulfur content <= 1.0%, and coarse-grained interlocking of single-type coal coking coal < 30%.

[0042] Gas coal is classified into two categories: volatile matter, sulfur content, microstructure, and Y value.

[0043] High-G value gas coal is designated as Gas Coal 1#: volatile matter (Vdaf) > 36%, G value > 80, and isotropic content < 5%; low-G value gas coal is designated as Gas Coal 2#: volatile matter (Vdaf) > 36%, G value 60–80, and isotropic content > 5%.

[0044] Lean coal is classified into three categories: volatile matter, sulfur content, and gamma value.

[0045] Low-sulfur lean coal is designated as Lean Coal 1#: volatile matter (Vdaf) > 10%–20%, G value 20–65, 1.0% ≤ sulfur content ≤ 2.5%; high-sulfur lean coal is designated as Lean Coal 2#: volatile matter (Vdaf) > 10%–20%, G value 30–65, sulfur content 1.0%; lean coal is designated as Lean Coal: volatile matter (Vdaf) > 10%–20%, G value 5–20.

[0046] S2. Functional Classification of Complex Coal Sources: Complex coal sources are classified into basic coal types, auxiliary coal types, and cost-reducing coal types according to their functions.

[0047] As shown in Table 1, the basic coal type is the coal type that must be selected for each coal blending scheme. It is usually a coal type with stable resources and a high proportion, such as coking coal 1#, coking coal 1A, coking coal 2#, fat coal 1#, 1 / 3 coking coal 1#, 1 / 3 coking coal 2#, gas coal 1# and lean coal 1#.

[0048] Auxiliary coal types: resources are unstable, sometimes available and sometimes not, and the amount of resources cannot meet the needs of the three types of coke ovens, such as some large mine coals and imported coals, such as imported coking coal, No. 2 fat coal and No. 3 1 / 3 coking coal;

[0049] Coal types for cost reduction 4: These are mainly low-priced coals used for cost reduction, such as coking coal 2A, fat coal 3#, lean coal 2#, semi-lean coal, gas coal 2#, and coking coal 3#.

[0050]

[0051] Table 1 Functional Classification of Complex Coal Sources

[0052] S3. Spatial distribution rules: Each row of silos should first meet the needs of 8 basic coal types. Cost-reducing coal types and auxiliary coal types should be used in two systems per silo.

[0053] S31. Coke ovens come in three types: 7 meters, 6 meters, and 7.63 meters. The 6-meter coke oven uses coal with a 1-stage coal system, the 7-meter coke oven uses coal with a 2-stage coal system, and the 7.63-meter coke oven uses coal with a 3-stage coal system. The silos are arranged in three rows to supply the three coal systems, with 11 silos in each row, for a total of 33 silos. (Each row of silos corresponds to one coal system.)

[0054] S32. Each row of silos should first meet the needs of 8 basic coal types, with each row occupying 7 silos, requiring a total of 21 silos. If the single proportion of gas coal #1 and lean coal #1 in a certain blending system is higher than 8%, then gas coal #1 and lean coal #1 each need to occupy 1 silo, occupying a total of 2 silos. That is, the basic coal types of this blending system need to occupy 8 silos.

[0055] S33. Each row has 3-4 remaining silos, totaling 9-12 silos for auxiliary and cost-reducing coal types. Both cost-reducing and auxiliary coal types are used with one silo for two different systems (each row has 3-4 remaining silos, totaling 9-12 silos for one silo for two systems, equivalent to 6-8 auxiliary and cost-reducing coal types per row). To control coke sulfur content, only two coal types can be selected for each system of high-sulfur coke, high-sulfur fat, and high-sulfur lean coal (No. 1), requiring a maximum of two systems and 3 silos. Gas coal (No. 2) and lean coal are used for cost reduction, with all three systems required. Gas coal (No. 2) requires 2 silos, and lean coal requires 2 silos, totaling 4 silos. The remaining silos are used for auxiliary or high-proportion coal types.

[0056]

[0057]

[0058] Table 2. Spatial Distribution Rules of Three Rows of Warehouse Numbers and Coal Types

[0059] By combining "basic coal types + auxiliary coal types + cost-reducing coal types", and implementing a two-system approach for coal types with limited resources, the problem of large fluctuations in coal blending and coke quality caused by open-pit coal storage is overcome. Coal blending is basically achieved according to the mine site, which is conducive to stable control of blending quality and coke quality.

[0060] The specific blending scheme is as follows: Coking coal #1: 16-25%, Coking coal 1A: 8-14%, Coking coal #2: 8-14%, Fat coal #1: 8-12%, 1 / 3 coking coal #1: 7-15%, 1 / 3 coking coal #2: 5-15%, Gas coal #1: 5-10%, Lean coal #1: 7-14%, High-sulfur coke: 0-8%, High-sulfur lean: 0-8%; High-sulfur fat coal: 3-8%, Gas coal #2: 0-6%, Lean coal: 0-5%, Fat coal #3: 0-8%, Coking coal 2A: 0-5%, 1 / 3 coking coal #3: 0-5%, Imported coal: 0-5%. Coking is carried out in top-charged coke ovens of 6 meters or above, with dry-quenched coke CSR > 68.5% and M40 > 88.5%.

[0061] Example:

[0062] Step 1: The coal blending types of a certain coking plant include: gas coal 1#, gas coal 2#, 1 / 3 coking coal 1#, 1 / 3 coking coal 2#, 1 / 3 coking coal 3#, fat coal 1#, fat coal 2#, fat coal 3#, coking coal 1#, coking coal 1A, coking coal 2#, coking coal 2A, coking coal 3#, lean coal 1#, and high-sulfur lean coal 2#. The coal quality of each type is analyzed and subdivided, as shown in Table 1. This coking plant has three types of coke ovens with lengths of 7.63 meters, 6 meters, and 7 meters, and also has 3×11 silos.

[0063]

[0064] Table 3 Single Coal Experimental Data Step 2: Divide complex coal sources into basic coal types, auxiliary coal types, and cost-reducing coal types according to their functions.

[0065]

[0066] Table 4 Functional Classification of Complex Coal Sources

[0067] Step 3: Spatial distribution of complex coal source silos:

[0068] Silo distribution: First, basic coal types are accommodated, then cost-effective coal types, and finally auxiliary coal types, with the distribution system arranged in a gradual manner.

[0069] 1) Each row of silos should first meet the needs of 8 basic coal types. The remaining 3 silos in each row are for auxiliary coal types and cost-reducing coal types. If the ratio of gas coal 1 and lean coal 1 is less than 8%, two silos are needed for each of gas coal 1 and lean coal 1.

[0070] 2) There are 11 to 13 remaining bins in the 3rd row. In order to control the sulfur content of coke, only two coal types can be selected for each blending system of high sulfur coke, high sulfur fat, and high sulfur lean. That is, high sulfur coke, high sulfur lean, and high sulfur fat can be used in a maximum of two blending systems, requiring a total of 3 bins. One bin is used for two blending systems. Gas coal No. 2 and lean coal are used as cost-reduction coal types and are used in all three blending systems. Gas coal No. 2 requires two bins and lean coal requires two bins. One bin is used for two blending systems.

[0071] The remaining 4-6 auxiliary coal types are: coking coal 2A, imported coking coal, fat coal 2#, and 1 / 3 coking coal 3#.

[0072] 1 12 23 Coking Coal No. 1 Coking Coal No. 1 Coking Coal No. 1 2 13 24 Coking Coal 1A Coking Coal 1A Coking Coal 1A 3 14 25 Coking Coal No. 2 Coking Coal No. 2 Coking Coal No. 2 4 15 26 Jiao 3 Jiao 3 Jiao 3 5 16 27 1 / 3 coking coal #1 1 / 3 coking coal #1 1 / 3 coking coal #1 6 17 28 1 / 3 coking coal #2 1 / 3 coking coal #2 1 / 3 coking coal #2 7 18 29 1 / 3 coking coal #3 1 / 3 coking coal #3 1 / 3 coking coal #3 8 19 30 Coal No. 1 Coal No. 1 Coal No. 1 9 20 31 Fat 2# Fat 2# Fat 2# 10 21 32 Fat 3# Fat 3# Fat 3# 11 22 33 Lean Coal #1 Lean Coal #1 Lean Coal #1 11 22 33 Slim 2# Slim 2# Slim 2#

[0073] Table 5. Three-tier warehouse space distribution plan before implementation.

[0074] As shown in Table 5, the silos were not arranged according to function, with a maximum of 11 coal types per row. This limitation on the number of coal types that can be used significantly restricts the range of coal types that can be used, which is detrimental to both cost reduction and production maintenance. In addition, silos for a small proportion of coal types may result in high inventory days, while silos for a large proportion of coal types may be insufficient.

[0075]

[0076]

[0077] Table 6. Three-tier warehouse space distribution plan before implementation.

[0078] As shown in Table 6, even if the coal types are arranged according to their functions, the use of two systems in one warehouse is not implemented. Therefore, a maximum of 11 coal types can be used in one row. If auxiliary coal types are used, cost-reducing coal types cannot be used, and vice versa.

[0079]

[0080] Table 7. Implementation Plan for the Spatial Distribution of Three Rows of Warehouses (3)

[0081] (1) The number of coal types used has increased from 11 to 17, providing greater flexibility in resource selection.

[0082] (2) The use of coal types to reduce costs has been greatly increased, which is conducive to reducing the cost of coal blending.

[0083] (3) By using a combination of two systems in one silo, the utilization rate of the silo has been greatly improved, avoiding problems such as caking and hanging of small proportions of coal due to prolonged storage.

[0084] The application scheme is illustrated by taking Production 1 as an example.

[0085]

[0086] Table 8 Comparison of the Three-Row Warehouse Spatial Distribution Plan Before and After Implementation

[0087] As shown in Table 8, for top-loading coke ovens of 6 meters and above, all the above schemes achieve a dry-quenched coke CSR of 68%-70% and M40 > 88.5%. Scheme 3 reduces coal blending costs by more than 40 yuan / ton compared to Schemes 1 and 2, and utilizes four more coal types. Therefore, under the current widespread use of silo coal storage technology in coking enterprises, the silo coal spatial distribution method used in this invention offers greater resource selection flexibility, lower coal blending costs, and higher degree of freedom in coal blending, making it easy to promote and use.

[0088] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0089] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A method for adapting to the spatial distribution of coal storage in complex coal source silos, characterized in that: Includes the following steps: S1. Subdivision of complex coal sources and coal quality: Subdividing complex coal sources according to volatile matter, sulfur content, G value and coking microstructure; Specifically, coking coal is categorized into six types: sulfur content, microstructure, and other factors. Low-sulfur high-quality coking coal is designated as Coking Coal 1#: sulfur content <= 1.0%, coarse grain inclusion rate of single coal type ≥ 60%; High-sulfur high-quality coking coal is designated as Coking Coal 1A: 1.8% ≤ sulfur content ≤ 2.2%, coarse grain inclusion rate of single coal type ≥ 60%; Medium-sulfur high-quality coking coal is designated as Coking Coal 2#: 1.0% < sulfur content < 1.8%, coarse grain inclusion rate of single coal type ≥ 60%; Medium-sulfur general-quality coking coal is designated as Coking Coal 2A: 1.0% < sulfur content < 1.8%, 50% ≤ coarse grain inclusion rate of single coal type < 60%; High-sulfur general-quality coking coal is designated as Coking Coal 3#: 1.8% ≤ sulfur content ≤ 2.3%, 50% ≤ coarse grain inclusion rate of single coal type < 60%; Imported coking coal: sulfur content <= 1.0%, coarse grain inclusion rate of single coal type ≥ 50%; Coal in coking coal is classified into three categories: volatile matter, sulfur content, and Y value. Low-sulfur coking coal is designated as Coking Coal 1#: volatile matter (Vdaf) ≤ 33%, Y value > 25mm, sulfur content <= 1.0%; medium-sulfur coking coal is designated as Coking Coal 2#: volatile matter (Vdaf) ≤ 33%, Y value > 25mm, 1.0% < sulfur content < 1.8%; high-sulfur coking coal is designated as Coking Coal 3#: volatile matter (Vdaf) ≤ 33%, Y value > 25mm, 1.8% ≤ sulfur content ≤ 2.3%. 1 / 3 coking coal is classified into three categories: volatile matter, sulfur content, microstructure, and Y value. Low-sulfur, high-quality 1 / 3 coking coal is designated as 1 / 3 coking coal #1: volatile matter (Vdaf) ≤ 33%, sulfur content <= 1.0%, and coarse-grained interlocking of single-type coal coking coal ≥ 30%; Low-sulfur, high-volatile matter, high-fluidity 1 / 3 coking coal is designated as 1 / 3 coking coal #2: volatile matter (Vdaf) > 33%, G value > 85, sulfur content <= 1.0%, and Y value ≥ 22mm; Low-sulfur, general-quality, medium-volatile matter 1 / 3 coking coal is designated as 1 / 3 coking coal #3: volatile matter (Vdaf) ≤ 33%, sulfur content <= 1.0%, and coarse-grained interlocking of single-type coal coking coal < 30%; Gas coal is classified into two categories: volatile matter, sulfur content, microstructure, and Y value. High-G value gas coal is designated as Gas Coal 1#: volatile matter (Vdaf) > 36%, G value > 80, and isotropic properties below 5%; low-G value gas coal is designated as Gas Coal 2#: volatile matter (Vdaf) > 36%, G value 60~80, and isotropic properties above 5%. Lean coal is classified into three categories: volatile matter, sulfur content, and gamma value. Low-sulfur lean coal is designated as Lean Coal 1#: volatile matter (Vdaf) > 10%~20%, G value 20~65, sulfur content 1.0% ≤ 2.5%; high-sulfur lean coal is designated as Lean Coal 2#: volatile matter (Vdaf) > 10%~20%, G value 30~65, sulfur content 1.0%; lean coal is designated as Lean Coal: volatile matter (Vdaf) > 10%~20%, G value 5~20. S2. Functional Classification of Complex Coal Sources: Complex coal sources are divided into basic coal types, auxiliary coal types, and cost-reduction coal types according to their functions. Among them, the basic coal types are the mandatory coal types for each coal blending scheme, namely coking coal 1#, coking coal 1A, coking coal 2#, fat coal 1#, 1 / 3 coking coal 1#, 1 / 3 coking coal 2#, gas coal 1#, and lean coal 1#. The auxiliary coal types are those with unstable resources, sometimes available and sometimes unavailable, and whose resource quantity cannot meet the needs of the coke oven type. These are imported coking coal, fat coal 2#, and 1 / 3 coking coal 3#. The cost-reduction coal types are those with low prices used for cost reduction, namely coking coal 2A, fat coal 3#, lean coal 2#, semi-lean coal, gas coal 2#, and coking coal 3#. S3. Spatial Distribution Rules: Each row of silos first meets the needs of the 8 basic coal types. The cost-reduction coal types and auxiliary coal types are both used in two blending systems per silo.

2. The method for adapting to the spatial distribution of coal storage in complex coal source silos according to claim 1, characterized in that: The number of silos is between 33 and 35, and each silo has four feeding ports. There are three types of coke ovens: 6 meters, 7 meters and 7.63 meters. The coke output of the three types of ovens is similar, realizing coal blending according to the mine site.

3. The method for adapting to the spatial distribution of coal storage in complex coal source silos according to claim 1, characterized in that: Step S3 is as follows: S31. Coke ovens come in three types: 7 meters, 6 meters, and 7.63 meters. The 6-meter coke oven uses coal with a 1-combination system, the 7-meter coke oven uses coal with a 2-combination system, and the 7.63-meter coke oven uses coal with a 3-combination system. The silos are arranged in three rows to supply the three coal systems. There are 11 silos in each row, for a total of 33 silos. S32. Each row of silos should first meet the needs of 8 basic coal types, and each row should occupy at least 7 silos, for a total of 21 silos. If the proportion of gas coal #1 and lean coal #1 in a certain blend is higher than 8%, then gas coal #1 and lean coal #1 should each occupy 1 silo, for a total of 2 silos. That is, the basic coal types of this blend need to occupy 8 silos. S33. Each row has 3 to 4 remaining silos, for a total of 9 to 12 silos for auxiliary coal types and cost-reduction coal types. For both cost-reduction coal types and auxiliary coal types, one silo is used for two distribution systems.

4. The method for adapting to the spatial distribution of coal storage in complex coal source silos according to claim 3, characterized in that: In step S33, in order to control the sulfur content of coke, high-sulfur coke, high-sulfur lean coke, and high-sulfur fertilizer can be used in a maximum of 2 blending systems, requiring a total of 3 silos.

5. The method for adapting to the spatial distribution of coal storage in complex coal source silos according to claim 4, characterized in that: In step S33, gas coal #2 and lean coal are used as cost-reducing coal types, and are used in all three systems. Gas coal #2 requires 2 silos and lean coal requires 2 silos, occupying a total of 4 silos.

6. The method for adapting to the spatial distribution of coal storage in complex coal source silos according to claim 5, characterized in that: In step S33, the remaining silos are used for auxiliary coal types or for a large proportion of coal types.

7. The method for adapting to the spatial distribution of coal storage in complex coal source silos according to claim 1, characterized in that: The blending scheme is as follows: Coking coal #1: 16~25%, Coking coal 1A: 8~14%, Coking coal #2: 8~14%, Fat coal #1: 8~12%, 1 / 3 coking coal #1: 7~15%, 1 / 3 coking coal #2: 5~15%, Gas coal #1: 5~10%, Lean coal #1: 7~14%, High sulfur coke: 0~8%, High sulfur lean: 0~8%; High sulfur fat coal: 3~8%, Gas coal #2: 0~6%, Lean coal: 0~5%, Fat coal #3: 0~8%, Coking coal 2A: 0~5%, 1 / 3 coking coal #3: 0~5%, Imported coal: 0~5%.

8. The method for adapting to the spatial distribution of coal storage in complex coal source silos according to claim 1, characterized in that: For coking in top-loading coke ovens of 6 meters or above, the dry-quenched coke CSR > 68% and M40 > 88.5%.

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