CN112080311B - Coking coal blending and coking method for producing primary metallurgical coke by blending a large amount of lean coal - Google Patents
Coking coal blending and coking method for producing primary metallurgical coke by blending a large amount of lean coal Download PDFInfo
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Abstract
The invention provides a coking blending coal and a coking method for producing primary metallurgical coke by blending a large amount of lean coal, and the coking blending coal for producing the primary metallurgical coke by blending a large amount of lean coal comprises the following steps: lean coal, which accounts for 75-85% of the total weight of the blended coal; coking coal accounting for 2-7% of the total weight of the blended coal; fat coal, accounting for 5-15% of the total weight of the blended coal; additive: accounting for 3-7% of the total weight of the blended coal. The coal type used for coking and blending is simple in structure, only three coking coal resources of lean coal, coking coal and fat coal are adopted, and the coal blending accuracy, the coal quality index and the coke quality controllability in the production process are improved; the coke produced by the method has stable and controllable quality, reduces the production cost and greatly improves the economic benefit of enterprises.
Description
Technical Field
The invention belongs to the technical field of coking and coal blending methods, and particularly relates to a coking and coal blending method for producing primary metallurgical coke by blending a large amount of lean coal.
Background
The top-loading coke oven usually adopts a coal blending scheme structure with multiple coal types matched, including fat coal, coking coal, lean coal, 1/3 coking coal and the like, and the diversification of the coal types adopted during coal blending directly leads to the complexity of the coal quality index of the obtained matched coal and the instability of the cost.
Lean coal cannot be stably produced in actual production due to factors such as high coalification degree, low volatile components and caking index, small shrinkage in the coking process and the like.
Therefore, according to the actual conditions of coking enterprises and local coal resources, a coal blending scheme structure which can meet the requirements of customers on coke quality and ensure smooth production of the coke oven and massive participation of lean coal with low production cost and high cost performance must be developed.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides the coking coal blending and the coking method for producing the primary metallurgical coke by blending a large amount of lean coal, and the coke produced by the coal blending has stable and controllable quality, reduces the production cost and greatly improves the economic benefit of enterprises.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal, comprising:
lean coal, which accounts for 75-85% of the total weight of the blended coal;
coking coal accounting for 2-7% of the total weight of the blended coal;
fat coal, accounting for 5-15% of the total weight of the blended coal;
additive: accounting for 3-7% of the total weight of the blended coal.
Preferably, the coking coal blending for producing the primary metallurgical coke by blending a large amount of lean coal comprises:
lean coal accounting for 80-85% of the total weight of the blended coal;
coking coal accounting for 4-6% of the total weight of the blended coal;
fat coal accounting for 8-12% of the total weight of the blended coal;
additive: accounting for 4-6% of the total weight of the blended coal.
Preferably, the additive is a tar processing product, the softening point of the additive is 100-150 ℃, the toluene insoluble substance is 28-34%, the quinoline insoluble substance is 8-14%, the ash content is less than or equal to 1.0%, and the coking value is 45-55%.
Preferably, the ash content of the coking coal is less than or equal to 14 percent, the volatile matter is 19 to 25 percent, the Y value is more than or equal to 15mm, and the G value is more than or equal to 85.
Preferably, the fertilizer coal ash content is 10-15%, the volatile matter is more than or equal to 25%, the Y value is more than or equal to 25mm, and the G value is more than or equal to 95.
Preferably, the lean coal ash content is 10-11%, the volatile component is 15-18%, the Y value is 10-11mm, and the G value is 35-65.
The coking method for producing the primary metallurgical coke by using the coking coal blending comprises the steps of uniformly mixing the coal blending, loading the mixture into a coke oven, controlling the heating temperature of the coke oven to be 1245 and 1265 ℃ at the machine side and 1305 and 1325 ℃ at the coke side, and coking for 19-21 hours to obtain the primary metallurgical coke.
Preferably, the primary metallurgical coke-cooling strength M40 is more than 85%, M10 is less than 7.0%, the hot strength CRI is less than 30%, and CSR is more than 65%.
Compared with the prior art, the invention has the following beneficial effects:
the invention is applied to the process of producing the first-level metallurgical coke by the coking of the top-loading coke oven, and the lean coal with the dosage of more than 80 percent is added in the process of producing and blending the coal, so that the coke quality is stable and controllable, the production cost is reduced, the economic benefit of an enterprise is greatly improved, and the invention is suitable for the coking industry.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of the present invention are described in detail below with reference to examples, but the scope of protection is not limited thereto.
A coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal, comprising:
lean coal, which accounts for 75-85% of the total weight of the blended coal;
coking coal accounting for 2-7% of the total weight of the blended coal;
fat coal, accounting for 5-15% of the total weight of the blended coal;
additive: accounting for 3-7% of the total weight of the blended coal.
The additive is a tar processing product, preferably tar processing residue. The softening point of the additive is 100-150 ℃, toluene insoluble substances are 28-34%, quinoline insoluble substances are 8-14%, ash content is less than or equal to 1.0%, and coking value is 45-55%.
The ash content of the coking coal is less than or equal to 14 percent, the volatile matter is 19 to 25 percent, the Y value is more than or equal to 15mm, and the G value is more than or equal to 85.
The fertilizer coal ash content is 10-15%, the volatile matter is more than or equal to 25%, the Y value is more than or equal to 25mm, and the G value is more than or equal to 95.
The lean coal ash content is 10-11%, the volatile component is 15-18%, the Y value is 10-11mm, and the G value is 35-65.
The coking method for producing the primary metallurgical coke by using the coking coal blending comprises the steps of uniformly mixing the coal blending, loading the mixture into a coke oven, controlling the heating temperature of the coke oven to be 1245 and 1265 ℃ at the machine side and 1305 and 1325 ℃ at the coke side, and coking for 19-21 hours to obtain the primary metallurgical coke.
The prepared first-grade metallurgical coke-cooling strength M40 is more than 85 percent, M10 is less than 7.0 percent, the hot strength CRI is less than 30 percent, and CSR is more than 65 percent.
The invention relates to a coking coal blending and coking method, which comprises the following steps:
1. the lean coal has a high proportion up to 80%;
2. the coal type used for coking and blending is simple in structure, only three coking coal resources of lean coal, coking coal and fat coal are adopted, and the coal blending accuracy, the coal quality index and the coke quality controllability in the production process are improved;
3. a large amount of lean coal with rich local resources is matched, the coke production cost is effectively reduced under the condition that the original coking process is not changed, the method has great significance for improving the economic benefit of a coking plant, and a new way is opened up for cost reduction and efficiency improvement of enterprises.
Aiming at the local current situation, the lean coal resources are relatively rich and the cost performance is high, so that on the premise of ensuring the qualified coke quality, a large amount of lean coal is blended, and the coal blending cost can be effectively reduced.
The reason why the lean coal dosage can reach up to 80% is analyzed by combining the characteristics of the local lean coal and the structure of the scheme related to the invention as follows:
(1) first, the lean coal of the present invention has great advantages in regional selection, high cost performance and abundant resources, and thus, it is determined that the lean coal can be blended in large quantities.
(2) Secondly, analyzing the coal plasticity characteristics of local lean coal, and comprehensively evaluating the coal type by combining the single coking test data of the single coal in the test coke oven, wherein the specific data is shown in table 1:
TABLE 1 coal quality analysis results of local lean coal
The lean coal is subjected to independent coking analysis in a laboratory 20KG top-loading test coke oven, and the coking conditions of the test coke oven are as follows: the coal loading is 25KG, the coking time is 7 hours, and the central temperature of coke cake is about 960 ℃. The test results are as follows: the cold strength M25/M10 was 84.8%/12.0%, and the hot strength CRI/CSR was 30.6%/52.7%.
The analysis results show that the lean coal belongs to the lean coal with the coal rock reflectivity relatively close to the former, the content of iron element in the coal ash element analysis is low, so that the lean coal has good coking characteristics, and the lean coal has good single coking hot-state strength and cold-state strength by combining the test results of single coking, so that the lean coal can be determined to participate in coal blending and coking in a large amount.
(3) In addition, in combination with the scheme structure, the coal blending scheme provided by the invention is additionally provided with additives for solving the problems of low fluidity, thick colloid layer and poor reaction activity of the lean coal in the coking and pyrolysis processes.
(4) The effect of the additive on the lean coal, in addition to the effect of (3) above, also functions to some extent as a catalyst: the addition of the additive can greatly reduce the dosage of the high-quality coking coal; experiments prove that compared with other coal types, the scheme of blending the additive and the lean coal has the most obvious improvement on the coke quality.
The experimental scheme is as follows:
1/3 coking coal 15%, fat coal 15%, lean coal 40%, and lean coking coal 15%.
On the basis of the scheme, high-quality coking coal is reduced by 10%, 2% of additive is added, and 8% of lean coal or other coal is added, and coal blending coking data comparison is carried out, and the results are shown in table 2.
TABLE 2 comparative coking data for various coal types of additives
(5) Besides the additive, the fat coal with Y value of about 35mm is synchronously selected and matched with the additive, and plays a certain role in improving the fluidity of the colloid in the coking process. In addition, the sulfur content of the selected fat coal is 3.8-4.0%, the sulfur content of the lean coal is 0.37%, and if the dosage is 80%, the dosage of the fat coal can reach 10% to the maximum extent, the complementary action with the lean coal is more obvious, the strong combination with the additive is achieved, and the coking performance of coking by blending the lean coal with the coal is further improved.
The present invention will be described in further detail with reference to specific embodiments.
The results of the coal quality analysis of the specific selection of each individual coal are shown in table 3.
TABLE 3 Industrial analysis results of individual coals
Example 1
(1) Selecting the single coal in the table 3, and preparing the coal material according to the following weight ratio:
lean coal: 83%, coking coal I: 5%, fat coal I: 5%, fat coal II: 3 percent of additive and 4 percent of additive.
(2) And (2) uniformly mixing the raw material coals in the step (1) to obtain blended coal with indexes of 9.97% of ash, 19.06% of volatile matter, 0.75% of sulfur, 76% of bonding and 73.0% of fineness.
(3) And (3) applying the mixed coal in the step (2) to a 6-meter top-mounted coke oven, and obtaining qualified primary metallurgical coke with cold strength M40 of 87.5%, M10 of 5.8%, hot strength CRI of 23.6% and CSR of 70.9% under the coking conditions of the coke oven side heating temperature of 1255 ℃, the coke side heating temperature of 1315 ℃ and the coking time of 20.
Example 2
(1) Preparing coal materials according to the following weight ratio:
lean coal: 83%, coking coal II: 5%, fat coal I: 5%, fat coal II: 3 percent of additive and 4 percent of additive.
(2) And (2) uniformly mixing the raw material coals in the step (1) to obtain blended coal with indexes of 10.02% of ash content, 18.90% of volatile matter, 0.70% of sulfur, 73% of bonding and 73.2% of fineness.
(3) And (3) applying the mixed coal in the step (2) to a 6-meter top-mounted coke oven, and obtaining qualified primary metallurgical coke with cold strength M40 of 87.2%, M10 of 5.4%, hot strength CRI of 25.3% and CSR of 69.5% under the coking conditions of the coke oven side heating temperature of 1255 ℃, the coke side heating temperature of 1315 ℃ and the coking time of 20.
Example 3
(1) Preparing coal materials according to the following weight ratio:
lean coal: 83%, coking coal I: 2%, coking coal II: 3%, fat coal I: 5%, fat coal II: 3 percent of additive and 4 percent of additive.
(2) And (2) uniformly mixing the raw material coals in the step (1) to obtain blended coal with indexes of 10.02% of ash content, 18.90% of volatile matter, 0.70% of sulfur, 73% of bonding and 73.2% of fineness.
(3) And (3) applying the mixed coal in the step (2) to a 6-meter top-mounted coke oven, and obtaining qualified primary metallurgical coke with cold strength M40 of 85.6%, M10 of 5.9%, hot strength CRI of 25.2% and CSR of 68.2% under the coking conditions of the coke oven side heating temperature of 1255 ℃, the coke side heating temperature of 1315 ℃ and the coking time of 20.
Example 4
A coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal, comprising:
lean coal, accounting for 75% of the total weight of the coal blending; coking coal accounting for 7% of the total weight of the blended coal; fat coal, accounting for 15 percent of the total weight of the coal blending; additive: accounting for 3 percent of the total weight of the blended coal.
Uniformly mixing the blended coal, and then loading the mixture into a coke oven, wherein the coking conditions are controlled as follows: the coke oven side heating temperature is 1245 ℃, the coke side heating temperature is 1305 ℃, and the coking time is 21 ℃.
Example 5
A coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal, comprising:
lean coal accounting for 85% of the total weight of the blended coal; coking coal accounting for 2% of the total weight of the blended coal; fat coal accounting for 5% of the total weight of the blended coal; additive: accounting for 5 percent of the total weight of the blended coal.
Uniformly mixing the blended coal, and then loading the mixture into a coke oven, wherein the coking conditions are controlled as follows: the coke oven side heating temperature 1265 ℃, the coke side heating temperature 1325 ℃ and the coking time 19.
Example 6
A coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal, comprising:
lean coal, accounting for 80% of the total weight of the blended coal; coking coal accounting for 6% of the total weight of the blended coal; fat coal, accounting for 8% of the total weight of the blended coal; additive: accounting for 6 percent of the total weight of the blended coal.
Uniformly mixing the blended coal, and then loading the mixture into a coke oven, wherein the coking conditions are controlled as follows: the heating temperature of the coke oven side is 1250 ℃, the heating temperature of the coke side is 1310 ℃, and the coking time is 20 ℃.
Example 7
A coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal, comprising:
lean coal, accounting for 80% of the total weight of the blended coal; coking coal accounting for 4% of the total weight of the blended coal; fat coal accounting for 12% of the total weight of the blended coal; additive: accounting for 4 percent of the total weight of the blended coal.
Uniformly mixing the blended coal, and then loading the mixture into a coke oven, wherein the coking conditions are controlled as follows: the heating temperature of the coke oven side is 1260 ℃, the heating temperature of the coke side is 1320 ℃, and the coking time is 19 ℃.
Example 8
A coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal, comprising:
lean coal, which accounts for 78% of the total weight of the blended coal; coking coal accounting for 7% of the total weight of the blended coal; fat coal, accounting for 8% of the total weight of the blended coal; additive: accounting for 7 percent of the total weight of the blended coal.
Uniformly mixing the blended coal, and then loading the mixture into a coke oven, wherein the coking conditions are controlled as follows: the heating temperature of the coke oven side is 1260 ℃, the heating temperature of the coke side is 1320 ℃, and the coking time is 19 ℃.
The above analysis data are analyzed according to national standards.
The invention adopts a simple coal blending scheme structure, can greatly improve the accuracy of coal blending technical workers in the prejudgment of the indexes of blended coal and the coke quality, and reduces various problems of coke quality fluctuation, unstable production and the like caused by dosage deviation in the actual production.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A coking blending coal for producing primary metallurgical coke by blending a large amount of lean coal is characterized by comprising the following components:
lean coal accounting for 80-85% of the total weight of the blended coal;
coking coal accounting for 4-6% of the total weight of the blended coal;
fat coal accounting for 8-12% of the total weight of the blended coal;
additive: accounting for 4-6% of the total weight of the blended coal;
the additive is a tar processing product, the softening point of the additive is 100-150 ℃, the toluene insoluble substance is 28-34%, the quinoline insoluble substance is 8-14%, the ash content is less than or equal to 1.0%, and the coking value is 45-55%;
the coal quality parameter indexes of the lean coal are as follows:
fluidity index: onset softening temperature/° c: 472; curing temperature/. degree.C.: 516; plasticity interval/DEG C: 50; maximum flow degree dd/min: 6; maximum logarithm of degree of flow: 0.78;
the indexes of the Australian expansibility: softening temperature/. degree.C.: 442; initial expansion temperature/° c: 484; curing temperature/. degree.C.: 500, a step of; a value/%: 18; b value/%: -7; type of curve: negative expansion;
coal rock reflectivity: reflectance range: 1.400-1.899; average reflectance: 1.641;
the content of coal ash elements: na (Na)2O/%：0.43；K2O/%：0.26；Fe2O3/%：1.56；CaO/%：7.68；MgO/%：0.81。
2. The coking coal blending method for producing the primary metallurgical coke by blending a large amount of lean coal according to claim 1, wherein the ash content of the coking coal is less than or equal to 14 percent, the volatile matter is 19 to 25 percent, the Y value is more than or equal to 15mm, and the G value is more than or equal to 85.
3. The coking coal blending method for producing the first-class metallurgical coke by blending a large amount of lean coal according to claim 1, wherein the fat coal has 10-15% of ash content, 25% or more of volatile matter, 25mm or more of Y value and 95 or more of G value.
4. The coking coal blending method for producing the primary metallurgical coke by blending a large amount of lean coal as claimed in claim 1, wherein the lean coal has ash content of 10-11%, volatile matter content of 15-18%, Y value of 10-11mm, and G value of 35-65.
5. The coking method for producing the primary metallurgical coke by using the coking coal blending as claimed in any one of claims 1 to 4, characterized in that the primary metallurgical coke is obtained by uniformly mixing the blended coal and then putting the mixture into a coke oven, controlling the heating temperature of the coke oven to be 1245 ℃ at the machine side temperature and 1265 ℃ at the coke side temperature and 1325 ℃ for 19 to 21 hours.
6. The coking method for producing primary metallurgical coke by coking and blending coal according to claim 5, characterized in that the primary metallurgical coke has a cold strength M40 > 85%, M10 < 7.0%, a hot strength CRI < 30%, and a CSR > 65%.
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| DE1219439B (en) * | 1959-09-25 | 1966-06-23 | Eschweiler Bergwerksver | Process for the production of solid coke from solid fuels |
| JPS6429491A (en) * | 1987-07-24 | 1989-01-31 | Nippon Zeon Co | Production of coke |
| CN1145394A (en) * | 1996-08-29 | 1997-03-19 | 冶金工业部鞍山热能研究院 | Tech. for prodn. of casting coke mainly using weak coal |
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| CN101081989B (en) * | 2007-06-29 | 2010-05-19 | 武汉钢铁(集团)公司 | Coal coking blending method |
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| CN102851051A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Composite additive coal blending and coking method |
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| CN104593028A (en) * | 2015-01-15 | 2015-05-06 | 安徽工业大学 | Method for producing high-quality metallurgical coke by using coal and rock indexes |
| CN105112083B (en) * | 2015-08-20 | 2017-10-17 | 河北钢铁股份有限公司邯郸分公司 | A kind of method of high volatile coke making and coal blending |
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