A coking coal blending method based on the kay's fluidity index

Abstract

The present application provides a kind of based on Gieseler fluidity index coking coal blending method, the method comprises the following steps: according to volatile Vdaf and Gieseler maximum fluidity, each coking coal is classified;Each coking coal is divided into: first coking coal, second coking coal, third coking coal, fourth coking coal, fifth coking coal, sixth coking coal and seventh coking coal;The weight percentage of each coking coal after coal blending is: first coking coal: 5%~15%, second coking coal: 5%~15%, third coking coal: 10%~20%, fourth coking coal: 1%~5%, fifth coking coal: 25%~40%, sixth coking coal: 10%~20%, seventh coking coal: 10%~15%;Make after mixing the Gieseler maximum fluidity of coal 800~2000dd / min, G value is 78~82, Y value is 12~16, volatile Vdaf is 25%~28%.

Description

Technical Field

[0001] This invention relates to the field of coking coal blending technology, and specifically to a coking coal blending method based on the Gibbs freeness index. Background Technology

[0002] The Gibbs freeness of coking coal characterizes the viscosity of the colloidal mass formed during coal dry distillation. It reflects both the quantity and properties of the colloidal mass and is one of the indicators of coal plasticity. Gibbs freeness is an effective means of studying the rheology and pyrolysis kinetics of coal, and it can also characterize coal plasticity, which can be used to guide coal blending and predict coke strength. With the increasing emphasis on safe coal blending and stable coke oven production in the coking industry, excessive pushing current during the coke ejection process from the coke oven carbonization chamber, or even difficulty in pushing the coke, can damage the furnace walls and seriously threaten safe coke oven production. Improper coal blending is a major cause of high pushing current. For example, in coke production, an excessive pursuit of coke quality, unscientific proportions of different coal types, and unreasonable caking properties of the blended coal often easily lead to excessive pushing current. How to utilize coal blending technology to ensure safe and stable coke oven production while obtaining high-quality coke has become a crucial issue that coking professionals must address.

[0003] In summary, the existing technology has the following problems: how to use coal blending technology to ensure the safe and stable production of coke ovens and obtain high-quality coke. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of how to use coal blending technology to ensure the safe and stable production of coke ovens and obtain high-quality coke.

[0005] Therefore, this invention provides a method for coking coal blending based on the Kiel fluidity index, the method comprising the following steps:

[0006] Coking coals are classified according to their volatile matter content (Vdaf) and maximum fluidity (Giardstan).

[0007] Coking coal is classified into: Category I coking coal, Category II coking coal, Category III coking coal, Category IV coking coal, Category V coking coal, Category VI coking coal, and Category VII coking coal.

[0008] Coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility ≥ 20000 dd / min is classified as Category I coking coal; coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility ≤ 7000 dd / min < 20000 dd / min is classified as Category II coking coal; coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility ≤ 7000 dd / min is classified as Category III coking coal; coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility < 1000 dd / min is classified as Category IV coking coal; and coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility < 1000 dd / min is classified as Category IV coking coal. Coking coal with volatile matter ≤ 22% ≤ Vdaf < 28% and a maximum Gibbs free flow rate ≥ 800 dd / min is classified as Category V coking coal; coking coal with volatile matter ≤ 22% ≤ Vdaf ≤ 28% and a maximum Gibbs free flow rate ≤ 200 dd / min < 800 dd / min is classified as Category VI coking coal; coking coal with volatile matter ≤ 22% ≤ Vdaf ≤ 28% and a maximum Gibbs free flow rate ≤ 50 dd / min < 200 dd / min is classified as Category VI coking coal; coking coal with volatile matter ≤ 22% and a maximum Gibbs free flow rate < 50 dd / min is classified as Category VII coking coal.

[0009] The weight percentages of each coking coal after blending are as follows: Category I coking coal: 5%–15%, Category II coking coal: 5%–15%, Category III coking coal: 10%–20%, Category IV coking coal: 1%–5%, Category V coking coal: 25%–40%, Category VI coking coal: 10%–20%, and Category VII coking coal: 10%–15%.

[0010] The blended coal should have a maximum flowability of 800–2000 dd / min, a caking index of 78–82, a maximum plastic layer thickness of 12–16, and a volatile matter content (Vdaf) of 25%–28%.

[0011] Specifically, the weight percentages of each type of coking coal after blending are as follows: Type I coking coal: 10%, Type II coking coal: 10%, Type III coking coal: 15%, Type IV coking coal: 5%, Type V coking coal: 30%, Type VI coking coal: 15%, and Type VII coking coal: 15%.

[0012] Specifically, the blended coal has a maximum flowability of 1252 dd / min, a volatile matter content (Vdaf) of 27.2%, a caking index of 80, and a maximum plastic layer thickness of 13 mm.

[0013] Specifically, the blended coal is fed into a 6-meter top-loading coke oven for coking. The coke strength indicators are as follows: crush resistance M40 is 86.3%, abrasion resistance M10 is 5.8%, coke reactivity CRI is 25.52%, coke post-reaction strength is 64.3%, and the average current for pushing coke in the coke oven is 205A.

[0014] Specifically, the weight percentages of each type of coking coal after blending are as follows: Type I coking coal: 7%, Type II coking coal: 15%, Type III coking coal: 17%, Type IV coking coal: 3%, Type V coking coal: 33%, Type VI coking coal: 12%, and Type VII coking coal: 13%.

[0015] Specifically, the blended coal has a maximum flowability of 857 dd / min, a volatile matter content (Vdaf) of 27.5%, a caking index of 78, and a maximum plastic layer thickness of 12 mm.

[0016] Specifically, the blended coal is fed into a 6-meter top-loading coke oven for coking. The coke strength indicators are as follows: crush resistance M40 is 86.1%, abrasion resistance M10 is 5.9%, coke reactivity CRI is 26.4%, coke post-reaction strength is 63.5%, and the average current for pushing coke in the coke oven is 200A.

[0017] The beneficial effects are as follows: This invention utilizes the coal base fluidity index to effectively utilize various types of coal, ensuring coke quality while stabilizing coke oven production. When coking in a 6-meter coke oven, the coke quality indicators can reach: crush strength M40 greater than 86%, abrasion resistance M10 less than 6.0%, reactivity (CRI) less than 27%, post-reaction strength (CSR) greater than 63%, and both cold and hot coke strengths meet the national standard for Grade 1 coke; the coke oven pushing current is consistently below 220A, with no difficulty in pushing coke. Attached Figure Description

[0018] Figure 1 This is a flowchart of a coking coal blending method based on the Gibbs freeness index provided in an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0020] This invention utilizes a 7.5-meter top-loading coke oven for coking, with a coking time of 24 hours, full-load production, and dry quenching. It employs existing production processes and does not require additional pretreatment equipment.

[0021] In embodiments of the present invention, such as Figure 1 A method for coking coal blending based on the Gibbs freeness index is provided, the method comprising the following steps:

[0022] Coking coals are classified according to their volatile matter (Vdaf) and Gibbs maximum mobility;

[0023] Coking coal is classified into: Category I coking coal, Category II coking coal, Category III coking coal, Category IV coking coal, Category V coking coal, Category VI coking coal, and Category VII coking coal.

[0024] Coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility ≥ 20000 dd / min is classified as Category I coking coal; coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility ≤ 7000 dd / min < 20000 dd / min is classified as Category II coking coal; coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility ≤ 7000 dd / min is classified as Category III coking coal; coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility < 1000 dd / min is classified as Category IV coking coal; and coking coal with volatile matter (Vdaf) ≥ 28% and maximum Kidwell mobility < 1000 dd / min is classified as Category IV coking coal. Coking coal with volatile matter ≤ 22% ≤ Vdaf < 28% and a maximum Gibbs free flow rate ≥ 800 dd / min is classified as Category V coking coal; coking coal with volatile matter ≤ 22% ≤ Vdaf ≤ 28% and a maximum Gibbs free flow rate ≤ 200 dd / min < 800 dd / min is classified as Category VI coking coal; coking coal with volatile matter ≤ 22% ≤ Vdaf ≤ 28% and a maximum Gibbs free flow rate ≤ 50 dd / min < 200 dd / min is classified as Category VI coking coal; coking coal with volatile matter ≤ 22% and a maximum Gibbs free flow rate < 50 dd / min is classified as Category VII coking coal.

[0025] The weight percentages of each coking coal after blending are as follows: Category I coking coal: 5%–15%, Category II coking coal: 5%–15%, Category III coking coal: 10%–20%, Category IV coking coal: 1%–5%, Category V coking coal: 25%–40%, Category VI coking coal: 10%–20%, and Category VII coking coal: 10%–15%.

[0026] The blended coal achieves a maximum Gibbs freeness of 800–2000 dd / min, a G value of 78–82, a Y value of 12–16, and a volatile matter (Vdaf) of 25%–28%. The G value refers to the caking index (GR.I), and the Y value refers to the maximum thickness of the plastic layer. This achieves the rational use of coking coal resources and, while producing high-quality coke, also stabilizes the coke oven pushing current, preventing difficult coke pushing. For top-charged coke ovens with a carbonization chamber height of 6 meters, a pushing current of 250A is generally considered the limit; a current higher than 250A is considered excessive, while a current lower is relatively safe. This invention stabilizes the coke oven pushing current below 220A, preventing difficult coke pushing.

[0027] As one example: the weight percentages of each coking coal after blending are as follows: Category I coking coal: 10%, Category II coking coal: 10%, Category III coking coal: 15%, Category IV coking coal: 5%, Category V coking coal: 30%, Category VI coking coal: 15%, and Category VII coking coal: 15%. The blended coal has a maximum Gibbs freeness of 1252 dd / min, a volatile matter content (Vdaf) of 27.2%, a G value of 80, and a Y value of 13 mm. The blended coal is then fed into a 6-meter top-charged coke oven for coking. The resulting coke strength indicators are: crush resistance (M40) of 86.3%, abrasion resistance (M10) of 5.8%, coke reactivity (CRI) of 25.52%, post-reaction strength of 64.3%, and an average coke pushing current of 205 A.

[0028] As another embodiment: the weight percentages of each coking coal after blending are as follows: Category I coking coal: 7%, Category II coking coal: 15%, Category III coking coal: 17%, Category IV coking coal: 3%, Category V coking coal: 33%, Category VI coking coal: 12%, and Category VII coking coal: 13%. The blended coal has a maximum Gibbs freeness of 857 dd / min, a volatile matter content (Vdaf) of 27.5%, a G value of 78, and a Y value of 12 mm. The blended coal is then fed into a 6-meter top-charged coke oven for coking. The resulting coke strength indicators are: crush resistance M40 of 86.1%, abrasion resistance M10 of 5.9%, coke reactivity CRI of 26.4%, post-reaction strength of 63.5%, and an average coke pushing current of 200 A.

[0029] This invention utilizes the coal base fluidity index to effectively utilize various types of coal, ensuring coke quality while stabilizing coke oven production. When coking in a 6-meter coke oven, the coke quality indicators can reach: crush strength M40 greater than 86%, abrasion resistance M10 less than 6.0%, reactivity (CRI) less than 27%, post-reaction strength (CSR) greater than 63%, and both cold and hot coke strengths meet the national standard for Grade 1 coke. The coke oven pushing current is consistently below 220A, with no difficulty in pushing coke.

[0030] Example 1:

[0031] This invention provides a method for coking coal blending based on the Gibbs freeness index. The specific method is as follows:

[0032] (1) Adjust the proportion of various coking coals and control the blended coal to meet the following process parameters: maximum flowability of Gibbs freeness between 800 and 2000 dd / min, volatile matter Vdaf between 25% and 28%, G value between 78 and 82, and Y value between 12 and 16 mm.

[0033] (2) The specific proportions of various types of coking coal are as follows: 10% for Class I coal, 10% for Class II coal, 15% for Class III coal, 5% for Class IV coal, 30% for Class V coal, 15% for Class VI coal, and 15% for Class VII coal.

[0034] (3) After mixing, the maximum flowability of Gibbs is 1252dd / min, the volatile matter Vdaf is 27.2%, the G value is 80, and the Y value is 13mm.

[0035] (4) When coking is carried out in a 6-meter top-loading coke oven, the coke strength indicators can reach: crush resistance M40 is 86.3%, abrasion resistance M10 is 5.8%, coke reactivity CRI is 25.52%, and coke post-reaction strength is 64.3%. The average current for pushing coke in the coke oven is 205A.

[0036] Example 2:

[0037] This invention provides a method for coking coal blending based on the Gibbs freeness index. The specific method is as follows:

[0038] (1) Adjust the proportion of various coking coals and control the blended coal to meet the following process parameters: maximum flowability of Gibbs freeness between 800 and 2000 dd / min, volatile matter Vdaf between 25% and 28%, G value between 78 and 82, and Y value between 12 and 16 mm.

[0039] (2) The specific proportions of various types of coking coal are as follows: Class I coal 7%, Class II coal 15%, Class III coal 17%, Class IV coal 3%, Class V coal 33%, Class VI coal 12%, and Class VII coal 13%.

[0040] (3) After mixing, the maximum flowability of Gibbs is 857dd / min, the volatile matter Vdaf is 27.5%, the G value is 78, and the Y value is 12mm.

[0041] (4) When coking is carried out in a 6-meter top-loading coke oven, the coke strength indicators can reach: crush resistance M40 is 86.1%, abrasion resistance M10 is 5.9%, coke reactivity CRI is 26.4%, and coke post-reaction strength is 63.5%. The average current for pushing coke in the coke oven is 200A.

[0042] The above description is only a preferred embodiment of the present invention. Any combination of values ​​within the range of implementation condition parameters disclosed in the present invention can be used to implement the present invention and is considered to be within the protection scope of the present invention.

[0043] This invention utilizes the coal base fluidity index to effectively utilize various types of coal, ensuring coke quality while stabilizing coke oven production. When coking in a 6-meter coke oven, the coke quality indicators can reach: crush strength M40 greater than 86%, abrasion resistance M10 less than 6.0%, reactivity (CRI) less than 27%, post-reaction strength (CSR) greater than 63%, and both cold and hot coke strengths meet the national standard for Grade 1 coke. The coke oven pushing current is consistently below 220A, with no difficulty in pushing coke.

[0044] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. The various components of the present invention can be combined with each other without conflict. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for coking coal blending based on the Gibbs freeness index, characterized in that, The method includes the following steps: According to the volatile matter V daf Classify coking coals based on their maximum fluidity; Coking coal is classified into: Category I coking coal, Category II coking coal, Category III coking coal, Category IV coking coal, Category V coking coal, Category VI coking coal, and Category VII coking coal. Volatile components V daf Coking coal with a volatile matter content ≥28% and a maximum Gibbs freeness ≥20000 dd / min is classified as Category I coking coal; volatile matter content V daf Coking coal with a volatile matter content ≥28% and a flow rate ≤7000 dd / min ≤ Kiel maximum flow rate <20000 dd / min is classified as Category II coking coal; volatile matter content V daf Coking coal with ≥28% volatile matter and a maximum flow rate of 1000 dd / min ≤ Gibbs maximum flow rate < 7000 dd / min is classified as Category III coking coal; volatile matter V daf Coking coal with ≥28% volatile matter and a maximum Gibbs freeness <1000 dd / min is classified as Category IV coking coal; volatile matter ≤22% V daf Coking coal with volatile matter content < 28% and a maximum Gibbs freeness ≥ 800 dd / min is classified as Category V coking coal; volatile matter content ≤ 22% V daf Coking coal with ≤28% volatile matter and 200 dd / min ≤ Gibbs maximum fluidity < 800 dd / min is classified as Category VI coking coal; volatile matter ≤22% V daf Coking coal with a volatile matter content ≤28% and a flow rate ≤50dd / min ≤ Gibbs maximum fluidity <200dd / min is classified as Category VI coking coal; volatile matter content V daf Coking coal with a viscosity ≤22% and a maximum Gibbs flow rate <50 dd / min is classified as Category VII coking coal. The weight percentages of each coking coal after blending are as follows: Category I coking coal: 5%~15%, Category II coking coal: 5%~15%, Category III coking coal: 10%~20%, Category IV coking coal: 1%~5%, Category V coking coal: 25%~40%, Category VI coking coal: 10%~20%, and Category VII coking coal: 10%~15%. The blended coal should have a maximum Gibbs freeness of 800–2000 dd / min, a caking index of 78–82, a maximum plastic layer thickness of 12–16 mm, and a volatile matter content of V0.

05. daf It is 25% to 28%.

2. The coking coal blending method based on the Gibbs free flow index according to claim 1, characterized in that, The weight percentages of each coking coal after blending are as follows: Category I coking coal: 10%, Category II coking coal: 10%, Category III coking coal: 15%, Category IV coking coal: 5%, Category V coking coal: 30%, Category VI coking coal: 15%, and Category VII coking coal: 15%.

3. The method for coking coal blending based on the Gibbs freeness index according to claim 2, characterized in that, The blended coal achieves a maximum Gibbs freeness of 1252 dd / min and a volatile matter content of V. daf The viscosity is 27.2%, the adhesion index is 80, and the maximum thickness of the adhesive layer is 13mm.

4. The coking coal blending method based on the Gibbs freeness index according to claim 3, characterized in that, The blended coal is fed into a 6-meter top-loading coke oven for coking, and the coke strength index is: crushing strength M 40 The wear resistance is 86.3%, and the wear resistance M 10 The coke reactivity CRI was 25.52%, the coke post-reaction strength was 64.3%, and the average current for pushing coke in the coke oven was 205A.

5. The coking coal blending method based on the Gibbs free flow index according to claim 1, characterized in that, The weight percentages of each coking coal after blending are as follows: Category I coking coal: 7%, Category II coking coal: 15%, Category III coking coal: 17%, Category IV coking coal: 3%, Category V coking coal: 33%, Category VI coking coal: 12%, and Category VII coking coal: 13%.

6. The coking coal blending method based on the Gibbs free flow index according to claim 5, characterized in that, The blended coal achieved a maximum Gibbs freeness of 857 dd / min and a volatile matter content of V. daf The viscosity is 27.5%, the adhesion index is 78, and the maximum thickness of the adhesive layer is 12mm.

7. A method for coking coal blending based on the Gibbs freeness index according to claim 6, characterized in that, The blended coal is fed into a 6-meter top-loading coke oven for coking, and the coke strength index is: crushing strength M 40 The wear resistance is 86.1%, and the wear resistance M 10 The coke reactivity CRI was 26.4%, the coke post-reaction strength was 63.5%, and the average current for pushing coke in the coke oven was 200A.

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