Coal blending and coking method for regulating and controlling fusibility of coking coal ash and coke
By measuring the initial melting temperature of coal ash of coking coal and limiting the ratio of coal with low melting temperature, the problem of low thermal strength of coke is solved, and the effect of improving the thermal strength of coke and avoiding ash agglomeration is achieved.
Patent Information
- Application Number
- CN202510107337.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-05-02
AI Technical Summary
The prior art is difficult to effectively improve the thermal strength of coke, especially when considering the ash agglomeration problem.
By measuring the initial melting temperature of coal ash of coking coal, limiting the ratio of coal low-melting temperature, increasing the melting temperature of coal ash of coal mixing coal ash, thereby avoiding ash agglomeration and increasing the thermal strength of coke.
The effect of improving the thermal strength of coke is achieved, ensuring that the thermal strength of coke reaches or exceeds 67%, and avoiding the reduction of thermal strength caused by ash agglomeration.
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Abstract
Description
Technical Field
[0001] The present application relates to the field of coking technology, and in particular to a coal blending coking method for regulating the fusibility of coking coal ash, and coke. Background Art
[0002] Coke is made by heating bituminous coal to 950-1050℃ under air-tight conditions, and then drying, pyrolysis, melting, bonding, solidification, shrinkage and other stages. This process is called high-temperature coking. Coke obtained by high-temperature coking can be used for blast furnace smelting, casting and gasification. Coke can be used as a reducing agent, energy source and carbon supply agent in blast furnace ironmaking, cupola casting, ferroalloy smelting and non-ferrous metal smelting. It can also be used in calcium carbide production, gasification and synthetic chemistry. According to statistics, more than 90% of the world's coke production is used for blast furnace ironmaking. Metallurgical coke has become one of the necessary raw materials required for modern blast furnace ironmaking technology and is known as the "basic food" of the steel industry. The skeleton role of metallurgical coke is increasingly irreplaceable in the process of large-scale blast furnaces. The thermal strength of coke is an important parameter to ensure the air permeability during the soft melting and dripping process of the blast furnace.
[0003] The conventional coal blending process ensures the strength of coke by controlling the coking index, gelatinous layer thickness, Oya expansion and other coking indexes of the blended coal. If the thermal strength of coke is reduced, the coking index is improved by increasing the proportion of high-quality coking coal. In addition, it is proposed to consider parameters such as the mineral catalytic index or alkalinity index and active-inert ratio of the blended coal to stabilize the thermal strength of coke, but the effects of these three parameters on different coal blending systems are inconsistent, and the above-mentioned indicators or parameters do not take into account the problem of ash agglomeration found in the actual production process. Therefore, it is urgent to develop a method that can improve the thermal strength of coke. Summary of the invention
[0004] The present application provides a coal blending coking method and coke for regulating the fusibility of coking coal ash, so as to solve the following technical problem: how to improve the thermal strength of coke.
[0005] In a first aspect, the present application provides a method for coking by coal blending to control the fusibility of coking coal ash, the method comprising:
[0006] According to the method of GB / T 219-2008, the initial melting temperature of the coal ash of the coking coal to be tested is determined;
[0007] Determine whether the initial melting temperature of the coal ash satisfies a set temperature value;
[0008] If the conditions are met, the coking coal to be tested is defined as low melting temperature coal;
[0009] The coking coal raw materials are mixed to obtain a coal blending system; the content of the low melting temperature coal in the coal blending system is ≤15% by mass;
[0010] The coal blending system is subjected to coking to obtain coke.
[0011] Optionally, the initial melting temperature of the coal ash is the initial shrinkage temperature of the coal ash cone.
[0012] Optionally, the set temperature value is 1100°C.
[0013] Optionally, the coking coal raw materials of the coal blending system include: coking coal, fat coal, one-third coking coal, gas coal and lean coal; the coking coal contains low melting temperature coking coal, the fat coal contains low melting temperature fat coal, the one-third coking coal contains one-third low melting temperature coking coal, and the low melting temperature coking coal, the low melting temperature fat coal and the one-third low melting temperature coking coal together constitute low melting temperature coal.
[0014] Optionally, the content of the low melting temperature coal is 5% to 15% by mass.
[0015] Optionally, the content of the low melting temperature coal is 6% to 10% by mass.
[0016] Optionally, in terms of mass fraction, the content of the coking coal is 62% to 69%, the content of the fat coal is 0 to 15%, the content of the one-third coking coal is 5% to 23%, the content of the gas coal is 4% to 7%, and the content of the lean coal is 3% to 8%.
[0017] Optionally, the initial melting temperature of the coal ash in the coal blending system is greater than 1400°C.
[0018] In a second aspect, the present application provides coke prepared by the method described in any one of the embodiments in the first aspect.
[0019] Optionally, the thermal strength of the coke is greater than 67%.
[0020] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:
[0021] The present application provides a method for coking by blending coal to control the fusibility of coking coal ash, comprising: determining the initial melting temperature of the coal ash of the coking coal to be tested according to the method of GB / T 219-2008; judging whether the initial melting temperature of the coal ash satisfies a set temperature value; if so, defining the coking coal to be tested as a low melting temperature coal; mixing the coking coal raw materials to obtain a blending coal system; and coking the blending coal system to obtain coke. By analyzing the initial melting temperature of a single coking coal, limiting the proportion of low melting temperature coal, increasing the melting temperature of the blending coal ash, avoiding ash agglomeration during the thermal strength detection process, and thus improving the thermal strength of the coke. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0024] Figure 1 A schematic flow chart of a coal blending coking method for regulating the fusibility of coking coal ash provided in an embodiment of the present application. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0026] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.
[0027] In addition, in the description of the specification of the present application, the terms "including", "comprising", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this article, "at least one" means one or more, and "plurality" means two or more. "At least one", "the following at least one item (items)" or similar expressions refer to any combination of these items, including any combination of single items (items) or plural items (items). For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or plural, respectively.
[0028] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.
[0029] Figure 1 A schematic flow chart of a coal blending coking method for regulating the fusibility of coking coal ash provided in an embodiment of the present application.
[0030] See also Figure 1 The present application provides a coal blending coking method for regulating the fusibility of coking coal ash, the method comprising:
[0031] S1. According to the method of GB / T 219-2008, the initial melting temperature of the coal ash of the coking coal to be tested is determined;
[0032] In some embodiments, the initial melting temperature of the coal ash is the initial shrinkage temperature of the coal ash cone.
[0033] GB / T 219-2008 is a method for determining the fusibility of coal ash. It specifies the definition, method summary, reagents and materials, instruments and equipment, test conditions, determination steps and precision of the fusibility of coal ash. It is applicable to lignite, bituminous coal, anthracite and water-coal slurry.
[0034] According to the method of GB / T 219-2008, the initial melting temperature of the ash of the coking coal to be tested is determined, specifically: by measuring the ash of coking coal fired at 850°C, the ash is made into a standard ash cone, and after drying and forming, it is placed in a high-temperature furnace. The temperature at which the ash cone initially shrinks is defined as the initial melting temperature, and coking coal with an initial melting temperature below 1100°C is defined as low melting temperature coal. During the melting temperature test, the temperature is before 900°C, the heating rate is 10°C / min, the temperature is greater than 900°C, the heating rate is 2°C / min, and the maximum temperature is 1500°C. The test is conducted in air atmosphere. A photo is taken at each temperature during the test, and the initial melting temperature is confirmed later.
[0035] S2, determining whether the initial melting temperature of the coal ash is lower than a set temperature value;
[0036] In some embodiments, the set temperature value is 1100°C.
[0037] S3. If the conditions are met, the coking coal to be tested is defined as low melting temperature coal;
[0038] Low melting temperature coal is part of coking coal, fat coal and one-third coking coal. Low melting temperature coking coal, low melting temperature fat coal and one-third coking coal are collectively referred to as low melting temperature coal.
[0039] S4, mixing the coking coal raw materials to obtain a coal blending system; the content of the low melting temperature coal in the coal blending system is ≤15% by mass;
[0040] By analyzing the initial melting temperature of a single coking coal, limiting the proportion of low melting temperature coal, increasing the melting temperature of the blended coal ash, and avoiding ash agglomeration during the thermal strength test, the thermal strength of coke is ensured. For example, the content of low melting temperature coal can be 6%, 8%, 10%, 12%, 14%, 15%, etc.
[0041] In some embodiments, the coking coal raw materials of the coal blending system include: coking coal, fat coal, one-third coking coal, gas coal and lean coal; the coking coal contains low melting temperature coking coal, the fat coal contains low melting temperature fat coal, the one-third coking coal contains one-third low melting temperature coking coal, and the low melting temperature coking coal, the low melting temperature fat coal and the one-third low melting temperature coking coal together constitute low melting temperature coal.
[0042] In some embodiments, the content of the low melting temperature coal is 5% to 15% by mass.
[0043] In some embodiments, the content of the low melting temperature coal is 6% to 10% by mass.
[0044] In some embodiments, by mass fraction, the content of the coking coal is 62% to 69%, the content of the fat coal is 0 to 15%, the content of the one-third coking coal is 5% to 23%, the content of the gas coal is 4% to 7%, and the content of the lean coal is 3% to 8%.
[0045] The coal blending structure is as follows: the mass ratio of coking coal is 62% to 69%, which saves coking coal resources while ensuring the strength of coke; the mass ratio of fat coal is 0 to 15%, which provides adhesive components and ensures the addition of resources such as gas coal and lean coal; the mass ratio of one-third coking coal is 5% to 23%, which provides partial adhesiveness to ensure the strength of coke; the mass ratio of gas coal is 4% to 7%, which is used as a supplementary resource for coking coal when the resources of coking coal and fat coal are limited; the mass ratio of lean coal is 3% to 8%, which corresponds to the ratio of coking coal and fat coal, plays a leaning effect and reduces the volatile matter of the blended coal. Exemplarily, the content of the coking coal can be 62%, 64%, 65%, 67%, 69% etc., the content of the fat coal can be 0, 2%, 4%, 8%, 10%, 12%, 15% etc., the content of the one-third coking coal can be 5%, 8%, 10%, 13%, 18%, 20%, 23% etc., the content of the gas coal can be 4%, 5%, 6%, 7% etc., and the content of the lean coal can be 3%, 4%, 5%, 6%, 7%, 8% etc.
[0046] In some embodiments, the initial melting temperature of the coal ash in the coal blending system is greater than 1400°C.
[0047] The present application reasonably designs the composition of the coke raw materials of the coal blending system, especially controls the proportion of low melting temperature coal, thereby increasing the initial melting temperature of the coal blending, and avoiding the ash agglomeration of the coke produced by the coal blending coking, which leads to a decrease in thermal strength. For example, the initial melting temperature of the coal ash of the coal blending system can be 1401°C, 1420°C, 1450°C, 1480°C, 1500°C, 1520°C, etc.
[0048] S5. Coking the coal blending system to obtain coke.
[0049] Based on a general inventive concept, the present application provides a coke.
[0050] In some embodiments, the thermal strength of the coke is > 67%.
[0051] The present application analyzes the initial melting temperature of a single coking coal, limits the proportion of low melting temperature coal, increases the melting temperature of the blended coal ash, and avoids ash agglomeration during the thermal strength detection process, thereby ensuring the thermal strength of the coke. For example, the thermal strength of the coke can be 67%, 67.2%, 67.5%, 67.8%, 68%, 68.2%, 68.5%, 69%, etc.
[0052] The coke is made based on the above-mentioned coke preparation method. The specific steps of the coke preparation method can refer to the above-mentioned embodiment. Since the coke adopts part or all of the technical solutions of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be described one by one here.
[0053] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to industry standards. If there is no corresponding industry standard, then the conditions recommended by the manufacturer are followed.
[0054] In the embodiments and comparative examples of the present application, main coking coal can be classified according to the coking coal in the classification method of GB5751-86, and the types of fat coal, 1 / 3 coking coal and lean coal can be distinguished according to the classification method of GB5751-86.
[0055] Example 1
[0056] This embodiment provides a coal blending coking method for regulating the fusibility of coking coal ash, comprising the following steps:
[0057] S11. According to the method of GB / T 219-2008, the initial melting temperature of coal ash of 18 kinds of coking coal to be tested was determined; the temperature at which the ash cone initially contracted was defined as the initial melting temperature;
[0058] S21, determining whether the initial melting temperature of the coal ash is lower than 1100° C.;
[0059] S31. If the conditions are met, the coking coal to be tested is defined as low melting temperature coal. It is determined that there are 8 types of low melting temperature coal, mainly coking coal, fat coal and part of one-third coking coal. Low melting temperature coking coal, low melting temperature fat coal and one-third coking coal are collectively referred to as low melting temperature coal.
[0060] S41. Mix the coking coal raw materials to obtain a coal blending system; the coking coal raw materials of the coal blending system include, by mass fraction: coking coal: 67%, fat coal: 15%, 1 / 3 coking coal: 7%, lean coal: 5%, and gas coal: 6%; the coking coal contains low melting temperature coking coal, the fat coal contains low melting temperature fat coal, the one-third coking coal contains one-third low melting temperature coking coal, the low melting temperature coking coal, the low melting temperature fat coal and the one-third low melting temperature coking coal together constitute low melting temperature coal, and the content of low melting temperature coal in the coal blending system is 10%.
[0061] S51, coking the coal blending system to obtain coke.
[0062] Example 2
[0063] The difference between Example 2 and Example 1 is that the content of low melting temperature coal in the coal blending system is 8%.
[0064] Example 3
[0065] The difference between Example 3 and Example 1 is that the content of low melting temperature coal in the coal blending system is 6%.
[0066] Comparative Example 1
[0067] The difference between Comparative Example 1 and Example 1 is that the content of low melting temperature coal in the coal blending system is 18%.
[0068] The initial melting temperature of ash in the coal blending system of the embodiment and the comparative example was detected, and the thermal strength of the coke was detected at the same time. The results are shown in Table 1.
[0069] Table 1 Initial melting temperature of ash and thermal strength of coke in coal blending system of embodiment and comparative example
[0070] Group Initial melting temperature of coal blending system / ℃ Coke thermal strength CSR / % Example 1 1401 67.2 Example 2 1430 67.3 Example 3 1500 68.4 Comparative Example 1 1183 65.0
[0071] As shown in Table 1, by reducing the proportion of low melting temperature coal, the coal ash melting temperature is higher than 1400℃, which can avoid ash agglomeration of coke produced by coal blending and coking, resulting in a decrease in thermal strength, and the thermal strength of coke is increased from 65% to 67%.
[0072] In addition, one or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
[0073] In an embodiment of the present invention, a coal blending coking method for regulating the fusibility of coking coal ash is proposed based on actual production problems. The method solves the technical problem that the existing bonding index is good but the thermal strength of the coke produced in the refinery is relatively low, supports the coking production to reduce costs, stabilize quality and improve efficiency, and also saves high-quality coking coal resources.
[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. A method for coking by blending coal for regulating the fusibility of coking coal ash, characterized in that: The method comprises: According to the method of GB / T 219-2008, the initial melting temperature of the coal ash of the coking coal to be tested is determined; Determine whether the initial melting temperature of the coal ash satisfies a set temperature value; If the conditions are met, the coking coal to be tested is defined as low melting temperature coal; The coking coal raw materials are mixed to obtain a coal blending system; the content of the low melting temperature coal in the coal blending system is ≤15% by mass; The coal blending system is subjected to coking to obtain coke.
2. The method according to claim 1, characterized in that The initial melting temperature of the fly ash is the initial shrinkage temperature of the fly ash cone.
3. The method according to claim 1, characterized in that The set temperature value is 1100°C.
4. The method according to claim 1, characterized in that: The coking coal raw materials of the coal blending system include: coking coal, fat coal, one-third coking coal, gas coal and lean coal; the coking coal contains low melting temperature coking coal, the fat coal contains low melting temperature fat coal, the one-third coking coal contains one-third low melting temperature coking coal, and the low melting temperature coking coal, the low melting temperature fat coal and the one-third low melting temperature coking coal together constitute low melting temperature coal.
5. The method according to claim 4, characterized in that Calculated by mass fraction, the content of the low melting temperature coal is 5% to 15%.
6. The method according to claim 5, characterized in that Calculated by mass fraction, the content of the low melting temperature coal is 6% to 10%.
7. The method according to claim 4, characterized in that In terms of mass fraction, the content of the coking coal is 62% to 69%, the content of the fat coal is 0 to 15%, the content of the one-third coking coal is 5% to 23%, the content of the gas coal is 4% to 7%, and the content of the lean coal is 3% to 8%.
8. The method according to claim 4, characterized in that The initial melting temperature of the coal ash in the coal blending system is greater than 1400°C.
9. Coke prepared by the method according to any one of claims 1 to 8.
10. The coke according to claim 9, characterized in that The thermal strength of the coke is >67%.