CN115044386A - Top-loading coking coal blending coking method for fully blending imported coal, product thereof and blended coal for coking - Google Patents
Top-loading coking coal blending coking method for fully blending imported coal, product thereof and blended coal for coking Download PDFInfo
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
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Abstract
The invention relates to a top-loading coking coal blending coking method for fully blending imported coal, a product thereof and blended coal for coking. The top-loading coking coal blending coking method of the fully-blended imported coal adopts the following coal blending ratio by mass percent to prepare the blended coal for coking: 40-60% of imported coking coal, 20-30% of imported fat coal, 5-15% of imported 1/3 coking coal and 10-20% of imported lean coking coal. The invention reasonably utilizes imported coal resources, overcomes the problems in coal blending of imported coal, ensures the quality of coke and greatly reduces the coal blending cost.
Description
Technical Field
The invention belongs to the technical field of coking and coal blending in the coking industry, and particularly relates to a top-loading coking and coal blending coking method for blending all imported coal, a product thereof and blended coal for coking.
Background
Top coke charging is a coking mode in which coking coal is charged from the top of a coke oven, and the bulk density of the coking coal in the coke oven is generally 0.77t/m 3 On the left and right sides, the top charging coke needs high-quality coking coal resources such as coking coal, fat coal and the like with high proportion to ensure the coke quality, and the consumption of the coal resources is large. In the coal resources of China, the reserves of high-quality coking coals such as coking coal, fat coal and the like are less, and the regional distribution of the resources is extremely unbalanced; with the large-scale development of blast furnaces and coke ovens, the consumption of high-quality coking coal resources is accelerated. Therefore, the coal import is reasonably developed, the imported coal resources are effectively utilized, the consumption of domestic coal resources is saved, and the energy supply safety is realized.
The researchers in China carry out a great deal of research on the imported coking coal, and the research shows that the imported coal has stable coal quality and lower ash content, volatile matter and sulfur content, and the ash content and the sulfur content of the coke can be reduced and the cold strength of the coke can be improved by coal blending and coking. In addition, the market price fluctuation of the imported coal is small, the supply is larger than the demand, and the integral price advantage is obvious. Therefore, more and more enterprises seek new coal sources abroad, and the proportion of imported coal in the coal blending structure of the coking plants of coastal steel enterprises such as sand steel, saddle steel, first steel and the like in China is kept between 20 and 40 percent for a long time. The major importers are australia, russia, usa, canada, indonesia, etc.
However, compared with domestic coking coal, imported coking coal has two major disadvantages: firstly, the thermal state intensity CSR is low due to high catalytic index of imported coal mine materials, late coal formation and the like; the second imported coal is poor in general inertness and compatibility. Therefore, due to the reasons of coal quality difference, regional limitation, supply guarantee and the like, domestic enterprises still take imported coal as a resource supplement to play a role in regulation, and reports of top-loaded coking coal which uses all imported coal are not available.
Disclosure of Invention
Based on the problems, the invention provides a top-loading coking coal blending coking method for fully blending imported coal, a product thereof and blended coal for coking, which reasonably utilizes imported coal resources, ensures the quality of coke and reduces the coal blending cost.
The invention provides a top-loading coal blending coking method for fully blending imported coal, which comprises the following steps of preparing blended coal for coking by adopting the following coal blending ratio in percentage by mass: 40-60% of imported coking coal, 20-30% of imported fat coal, 5-15% of imported 1/3 coking coal and 10-20% of imported lean coking coal;
wherein the V of the inlet coking coal daf Within the range of 20-28%, G is more than or equal to 80, and CSR of the single coking coke is more than or equal to 60%;
v of the imported fat coal daf In the range of 28-35%, the maximum fluidity is more than or equal to 12000ddpm, and the CSR of the single coking coke is more than or equal to 50%;
v of the inlet 1/3 coking coal daf In the range of 30-37%, the maximum fluidity is more than or equal to 5000 ddpm; the CSR of the single coking coke is more than or equal to 45 percent;
v of the imported lean coke coal daf Within the range of 15-20%, G is not less than 65.
The second aspect of the present invention provides a blended coal for coking, which is prepared by blending all of the raw materials of the blended coal, wherein the blending ratio of the raw materials of the blended coal is as follows: 40-60% of imported coking coal, 20-30% of imported fat coal, 5-15% of imported 1/3 coking coal and 10-20% of imported lean coking coal;
v of the inlet coking coal daf Within the range of 20-28%, G is more than or equal to 80, and CSR of the single coking coke is more than or equal to 60%;
v of the imported fat coal daf In the range of 28-35%, the maximum fluidity is more than or equal to 12000ddpm, and the CSR of the single coking coke is more than or equal to 50%;
v of the inlet 1/3 coking coal daf In the range of 30-37%, the maximum fluidity is more than or equal to 5000 ddpm; the CSR of the single coking coke is more than or equal to 45 percent;
v of the imported lean coke coal daf Within the range of 15-20%, G is not less than 65.
In a third aspect of the present invention, there is provided a coke refined using the top-loading coal blending coking method.
In some embodiments, the percentage of the imported coking coals is 40% to 60%, one type of imported coking coals is 25% to 35%, and the second type of imported coking coals is 15% to 25%.
In some embodiments, the imported coking coal comprises one or more of australian coking coal, mongolian coking coal, canadian coking coal.
In some embodiments, the imported fat coal comprises one or more of U.S. fat coal, Indonesian fat coal.
In some embodiments, the inlet 1/3 coking coal comprises one or more of australian 1/3 coking coal, us 1/3 coking coal, new zealand 1/3 coking coal.
In some embodiments, the imported lean coke comprises one or more of australian, american, and russian lean coke.
In an embodiment, the individual coking coke CSR is measured using a 40kg coke oven according to YB/T4526-2016 Small Coke oven Specification for coking test.
In a specific embodiment, in the coal blending coking method and the blended coal, the blended coal satisfies the following parameters: v daf In the range of 22-26%, ash content A d Less than or equal to 10 percent, the sulfur content St is less than or equal to 0.70 percent, the bonding index G is greater than or equal to 78, and the maximum thickness Y of the colloidal layer is greater than or equal to 17 mm.
In a specific embodiment, the coke obtained by the coal blending coking method meets the following parameters: crushing strength M 40 Greater than or equal to 90 percent and abrasion resistance M 10 Less than or equal to 6 percent, the reactivity CRI less than or equal to 24 percent, the strength CSR after reaction more than or equal to 68 percent, and the ash content A d Less than or equal to 12 percent of sulfur, S t，d ≤0.65％。
Has the advantages that:
the technical personnel of the invention select the imported coal varieties with high CSR and high fluidity by controlling two indexes of temperature intervals of thermal state strength and fluidity of single coking, thereby realizing good compatibility of the coal of each country and solving the problems of low thermal state strength CSR, poor general inertness-tolerant ability and poor compatibility of the imported coal caused by high catalytic index of imported coal mine substances, late coal formation and the like in the imported coal blending.
The top-loading coke blending coal coking method completely depends on coal import, and the domestic coal resource consumption is reduced to the maximum extent; does not need to use domestic coal, and is suitable for domestic enterprises to build factories overseas (such as Indonesia, India and the like); the top-loading coke coal blending coking method is suitable for all top-loading coke oven types with the diameter of more than 7m, the coke quality is greatly superior to the primary coke standard, the coke quality is very stable, and the top-loading coke coal blending coking method is particularly suitable for being used for 3000m 3 The above large-scale blast furnace; the coal blending and coking method has lower overall coal blending cost and is 50-150 yuan/ton lower than the average coal blending cost of domestic same-quality coke.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some embodiments, materials, elements, methods, means, and the like that are well known to those skilled in the art are not described in detail in order to not unnecessarily obscure the present invention.
The terms:
throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
The coking coal in the invention is raw material coal which has certain caking property, can coke under the coking condition of a chamber coke oven and is used for producing coke with certain quality. According to the classification standard of coal in China, poor lean coal, coking coal, fat coal, 1/3 coking coal, gas fat coal, gas coal and 1/2 sticky coal in the bituminous coal belong to coking coal.
Unless otherwise indicated, the coal varieties referred to in the present invention are the coal varieties defined according to the national standard GB/T5751-2009.
The invention relates to 'one kind of imported coking coal' which is imported coking coal meeting the coking coal requirement defined by national standard GB/T5751-. The 'second-class imported coking coal' refers to imported coking coal which meets the coking coal requirement defined by the national standard GB/T5751-2009 and is obtained by a single coking experiment of a 40kg small coke oven, wherein the CSR of the coke is less than 68%.
The invention relates to a top-loading coke blending coal coking method for fully blending imported coal, which comprises the following steps: (1) crushing and mixing various coking coals to obtain mixed coal; (2) feeding the blended coal into a coal tower, filling the blended coal into a coke oven carbonization chamber from a coal hole at the top of the coal tower, and performing dry distillation to obtain coke; (3) coke quenching and coke screening are carried out to obtain the product coke. Particularly, in the step (1), the grinding enables the particle size of the blended coal to be controlled to be less than 3mm and reach over 75 percent; in the step (2), the standard coking temperature is controlled within 1250-1350 ℃, and the coking time is 20-30 h.
The invention carries out a large number of screening tests on the coal types and the proportions of the imported coking coal, selects the imported coal types with high CSR and high fluidity by controlling two indexes of temperature intervals of the thermal state strength and the fluidity of the individual coking, and determines the coal blending ratio in percentage by mass as follows:
40-60% of imported coking coal, 20-30% of imported fat coal, 5-15% of imported 1/3 coking coal and 10-20% of imported lean coking coal, wherein in the 40-60% of imported coking coal, one type of imported coking coal accounts for 25-35% and the second type of imported coking coal accounts for 15-25%.
Table 1 shows the quality index of the coking coal used in the examples.
Quality index of coking coal used in Table 1
Test method
Ash content (A) d ) And volatile matter (V) daf ): the determination is carried out according to the quick ashing method A and the volatile component determination method in GB/T212-2008 & Industrial analytical methods for coal.
Sulfur content (S) of coal t ) And sulfur content (S) of coke t，d ): measured by the coulometry in GB/T214-2007 method for measuring total sulfur in coal and GB/T2286-2017 method for measuring total sulfur content in coke.
Bonding index (G value): the method is determined according to GB/T50047-2014 method for determining the bituminous coal caking index.
Y value: the measurement is carried out according to GB/T479-2016 method for measuring the colloidal layer index of bituminous coal.
The cold strength of the coke comprises crushing strength (M) 40 ) And abrasion resistance (M) 10 ): the measurement was carried out according to the first method in GB/T2006 + 2008 "method for measuring mechanical Strength of Coke".
Hot state strengths include Coke Reactivity (CRI) and post-reaction strength (CSR): the determination is carried out according to GB/T4000-2017 test method for coke reactivity and strength after reaction.
The individual coking experiments of 40kg small coke ovens were determined according to YB/T4526-2016 technical Specification for Small Coke ovens for coking tests.
Example 1
The embodiment provides a top-loading coking and coal blending coking method for fully blending imported coal, which adopts the coal blending ratio (in mass percentage) of Table 2, and comprises the following steps:
(1) blending coal according to the blending ratio in the table 2, crushing and uniformly mixing the blended coal to control the grain diameter to be less than 3mm to reach 75 percent, obtaining the blended coal, and carrying out quality detection on the blended coal, wherein the quality index is shown in the table 3;
(2) sending the crushed and uniformly mixed blended coal into a top-loading coke oven with the diameter of 7.63m for coking, and keeping the loading bulk density at 0.75t/m 3 Controlling the standard coking temperature within the range of 1280-1310 ℃ and the coking time to be 25.5-26 h;
(3) and cooling the coke by a dry quenching device after the coke is discharged. The quality of the obtained coke was measured and the quality index is shown in Table 4.
Example 2
This example provides a top-loading coking and coal blending coking method with all blended coal, which uses the coal blending ratio (by mass percentage) in Table 2, and the specific coking method comprises the following steps as in example 1, except that in step (2), a 7m top-loading coke oven is used in this example, the coking standard temperature is controlled within 1250-.
The quality index of the blended coal obtained in this example is shown in Table 3, and the quality index of the coke is shown in Table 4.
Example 3
This example provides a top-loading coal blending coking method with total blended coal, which uses the coal blending ratio (by mass percent) of table 2, and the specific coking method comprises the following steps as in example 2. The quality index of the blended coal obtained in this example is shown in Table 3, and the quality index of the coke is shown in Table 4.
Comparative example 1
The comparative example provides a top-loading coking coal blending coking method for fully blending imported coal, and the coal blending coking method comprises the step of adopting a coal blending ratio in mass percent in table 2, wherein the coal blending ratio is different from that of the example 1 in the ratio of the imported coking coal of one class and the imported coking coal of the second class, and the coal blending ratio of the imported coking coal of the comparative example 1 is lower than that of the example 1.
Comparative example 2
The present comparative example provides a top-loading coking coal blending coking method with total blended coal, which comprises using the coal blending ratio in mass percent in table 6, and differs from example 2 in that the present comparative example uses only 22% russian YNL fat coal for the single coking coke CSR.
Comparative example 3
The comparative example provides a top-loading coking coal blending coking method for fully blending imported coal, and the coal blending coking method comprises the step of adopting a coal blending ratio in mass percent in Table 7, and the coal type ratio of the comparative example is greatly different from that of the example 3, wherein the ratio of coking coal to fat coal is respectively lower, and the ratio of lean coking coal to 1/3 coking coal is respectively higher.
TABLE 2 coal blending ratio of examples and comparative examples
TABLE 3 quality index of blended coal
| A d | V daf | S t | G value | Value of Y | |
| Example 1 | 7.78％ | 24.5％ | 0.58％ | 84.2 | 17.3mm |
| Example 2 | 9.10％ | 24.7％ | 0.65％ | 81.0 | 17.3mm |
| Example 3 | 9.03％ | 25.3％ | 0.54％ | 84.0 | 17.1mm |
| Comparative example 1 | 7.66％ | 24.8％ | 0.57％ | 83.0 | 17.0mm |
| Comparative example 2 | 9.79％ | 24.9％ | 0.60％ | 81.6 | 18.5mm |
| Comparative example 3 | 8.94％ | 26.1％ | 0.54％ | 84.7 | 17.0mm |
TABLE 4 Coke quality index for top-loading coke ovens
The data of the examples in tables 3 and 4 show that the coke quality index obtained by coking with all the imported coal can meet the requirements, and the coke quality index is lower, and the cold strength (M) is lower 40 And M 10 ) And the hot state strength (CRI and CSR) are greatly superior to the national standard first-grade coke index.
From the comparative example data, the lower imported coke coal of comparative example 1 causes the thermal state strength of the produced coke to be greatly reduced; the use of the single coking coke CSR in comparative example 2 was only 22% russian YNL fat coal, resulting in a substantial reduction in the hot strength of the produced coke; in the coal blending ratio of the comparative example 3, the proportions of coking coal and fat coal are respectively lower, and the proportions of lean coking coal and 1/3 coking coal are respectively higher, so that the quality index of produced coke is poorer, and the coke does not reach the target of the invention.
Although the present application has been described with reference to preferred embodiments, it is not intended to limit the scope of the claims, and many possible variations and modifications may be made by one skilled in the art without departing from the spirit of the application.
Claims (10)
1. The top-loading coking coal blending coking method for all blended coal is characterized by comprising the following steps of preparing blended coal for coking by adopting the coal blending ratio in percentage by mass: 40-60% of imported coking coal, 20-30% of imported fat coal, 5-15% of imported 1/3 coking coal and 10-20% of imported lean coking coal;
wherein the V of the inlet coking coal daf Within the range of 20-28%, G is more than or equal to 80, and CSR of the single coking coke is more than or equal to 60%;
v of the imported fat coal daf In the range of 28-35%, the maximum fluidity is more than or equal to 12000ddpm, and the CSR of the single coking coke is more than or equal to 50%;
v of the inlet 1/3 coking coal daf In the range of 30-37%, the maximum fluidity is more than or equal to 5000ddpm, and the CSR of the single coking coke is more than or equal to 45%;
v of the imported lean coke coal daf Within the range of 15-20%, G is not less than 65.
2. The method for coking the top-loading coking coal blending with all blended imported coals as claimed in claim 1, wherein the ratio of the imported coking coals is 40% -60%, one type of imported coking coal is 25% -35%, and the other type of imported coking coal is 15% -25%.
3. The top-loading coking with coal blending according to claim 1, wherein the coke blending ratio of the total coal blending is the same as the above,
the imported coke coal comprises one or more of Australian coke coal, Mongolian coke coal and Canadian coke coal;
the imported fat coal comprises one or more of American fat coal and Indonesia fat coal;
the imported 1/3 coking coal comprises one or more of Australian 1/3 coking coal, American 1/3 coking coal and New Zealand 1/3 coking coal;
the imported lean coke coal comprises one or more of Australian lean coke coal, American lean coke coal and Russian lean coke coal.
4. The top-loading coking with coal blending according to claim 1, wherein the blended coal satisfies the following parameters:
V daf at 22%Ash content A in the range of 26% d Less than or equal to 10 percent, the sulfur content St is less than or equal to 0.70 percent, the bonding index G is greater than or equal to 78, and the maximum thickness Y of the colloidal layer is greater than or equal to 17 mm.
5. A coke made by a top-loading coal-blended coking process selected from the group consisting of the total blended-in coal of any of claims 1-4.
6. The coke of claim 5, wherein said coke satisfies the following parameters:
crushing strength M 40 Greater than or equal to 90 percent, and abrasion resistance M 10 Less than or equal to 6 percent, the reactivity CRI less than or equal to 24 percent, the strength CSR after reaction more than or equal to 68 percent, and the ash content A d Less than or equal to 12 percent, and the sulfur St is less than or equal to 0.65 percent.
7. The blended coal for coking with all blended coals is characterized in that the blending ratio of the raw materials of the blended coal is as follows: 40-60% of imported coking coal, 20-30% of imported fat coal, 5-15% of imported 1/3 coking coal and 10-20% of imported lean coking coal;
wherein the V of the inlet coking coal daf Within the range of 20-28%, G is more than or equal to 80, and CSR of the single coking coke is more than or equal to 60%;
v of the imported fat coal daf In the range of 28-35%, the maximum fluidity is more than or equal to 12000ddpm, and the CSR of the single coking coke is more than or equal to 50%;
v of the inlet 1/3 coking coal daf In the range of 30-37%, the maximum fluidity is more than or equal to 5000ddpm, and the CSR of the single coking coke is more than or equal to 45%;
v of the imported lean coke coal daf Within the range of 15-20%, G is not less than 65.
8. The blended coal for coking with total blended coals according to claim 7, characterized in that the percentage of the imported coking coals of 40% to 60% is 25% to 35% for one type and 15% to 25% for the second type.
9. The blended coal for coking with total blended coal according to claim 7, wherein,
the imported coke coal comprises one or more of Australian coke coal, Mongolian coke coal and Canadian coke coal;
the imported fat coal comprises one or more of American fat coal and Indonesia fat coal;
the imported 1/3 coking coal comprises one or more of Australian 1/3 coking coal, American 1/3 coking coal and New Zealand 1/3 coking coal;
the imported lean coke coal comprises one or more of Australian lean coke coal, American lean coke coal and Russian lean coke coal.
10. The blended coal for coking with total blended coal according to claim 7, wherein the blended coal satisfies the following parameters:
V daf in the range of 22-26%, ash content A d Less than or equal to 10 percent, the sulfur content St is less than or equal to 0.70 percent, the bonding index G is greater than or equal to 78, and the maximum thickness Y of the colloidal layer is greater than or equal to 17 mm.
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| CN202210854744.4A CN115044386B (en) | 2022-07-18 | 2022-07-18 | Top-loading coal blending coking method for fully blending imported coal, product thereof and blended coal for coking |
| PCT/CN2023/107922 WO2024017249A1 (en) | 2022-07-18 | 2023-07-18 | Top-charging coal blending and coking method and product thereof, and blended coal for coking |
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| WO2024017249A1 (en) * | 2022-07-18 | 2024-01-25 | 河北中煤旭阳能源有限公司 | Top-charging coal blending and coking method and product thereof, and blended coal for coking |
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| 程乐意;李良华;: "进口炼焦煤在宝钢的使用实践" * |
| 程乐意;李良华;: "进口炼焦煤在宝钢的使用实践", 宝钢技术 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024017249A1 (en) * | 2022-07-18 | 2024-01-25 | 河北中煤旭阳能源有限公司 | Top-charging coal blending and coking method and product thereof, and blended coal for coking |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115044386B (en) | 2023-05-12 |
| WO2024017249A1 (en) | 2024-01-25 |
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