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CN-116515514-B - Tamping coal blending coking method using 1/3 coking coal as main material

CN116515514BCN 116515514 BCN116515514 BCN 116515514BCN-116515514-B

Abstract

The invention relates to a tamping coal blending coking method mainly using 1/3 coking coal. The method comprises the following steps of 1) mixing various single coking coals, wherein the single coking coals comprise, by weight, 5% -10% of gas coals, 30% -40% of high-quality 1/3 coking coals, 25% -30% of common 1/3 coking coals, 7% -15% of gas-rich coals and 15% -25% of lean coals; 2) respectively pre-crushing the gas coal, the gas fat coal and the 1/3 coking coal, wherein the ratio of less than 3mm after pre-crushing is 80% -85%; crushing the blended coal, wherein the crushed proportion is 86% -88% and the crushed proportion is less than 48% and the crushed proportion is less than 0.5mm, and 3) tamping the blended coal to produce the blended coal on a tamping coke oven. The method can greatly reduce the application of coking coal and fat coal, and reduce the consumption of the shortage coal types, thereby reducing the cost of coke raw materials.

Inventors

  • REN HUAWEI
  • SHI JIANCAI
  • ZHAO XIAOXIN
  • LI HAOWEI
  • YANG LEI
  • SHEN MENGQI
  • ZHANG QINGQING

Assignees

  • 河北中煤旭阳能源有限公司

Dates

Publication Date
20260508
Application Date
20230607

Claims (7)

  1. 1. A coal blending coking method, the method comprising the steps of: 1) Mixing 5-10% of gas coal, 30-40% of high-quality 1/3 coking coal, 25-30% of common 1/3 coking coal, 7-15% of gas fat coal and 15-25% of lean coal, wherein the total amount of 1/3 coking coal is 60-70% and the total amount of all single coking coal is 100%; the index requirement of the high-quality 1/3 coking coal is that volatile component V daf is more than 28% -35%, the proportion of vitrinite reflectivity interval 0.65-0.85 reaches more than 80%, the bonding index G value is more than or equal to 80, the thermal state strength CSR of the single coking coke of 40kg small coke ovens is more than or equal to 45%, and the common 1/3 coking coal is other 1/3 coking coal which does not meet the index requirement; 2) Respectively pre-crushing the gas coal, the gas fat coal and the 1/3 coking coal, wherein the ratio of less than 3mm after pre-crushing is 80% -85%; pulverizing the mixed coal to obtain pulverized coal with a ratio of 86% -88% to less than 0.5mm and less than 48%, and 3) Tamping, controlling the tamping bulk density to be 1.0-1.1 t/m 3 , producing on a tamping coke oven, and coking for 26-28 hours, wherein the coke oven standard is 1340-1355 ℃, and dry quenching is adopted.
  2. 2. The method of claim 1, wherein, The vitrinite reflectance interval of the gas coal is 0.65-0.85 percent and reaches more than 80 percent, the bonding index G value is more than or equal to 75, and the thermal state strength CSR of the single coking coke of 40kg small coke ovens is more than or equal to 35 percent.
  3. 3. The method of claim 1, wherein, The volatile component V daf of the gas fertilizer coal is more than 37%, the vitrinite reflectance interval is 0.65-0.85% and reaches more than 80%, the bonding index G value is more than or equal to 90, the thermal state strength CSR of the single coking coke of 40kg small coke ovens is more than or equal to 35%, and the sulfur content S t,d is more than 2.5% -4.0%.
  4. 4. The method of claim 1, wherein, And the volatile component V daf of the lean coal is less than 20%, and the caking index G value is more than 10-20.
  5. 5. The method of claim 1, wherein, In the step 1), the quality index of the blended coal obtained after the blending of the single coking coals meets the following requirements that the volatile component V daf is 30% -33%, the sulfur content is less than or equal to 0.85%, the ash content is less than or equal to 10%, and the caking index G value is more than or equal to 66.
  6. 6. The method of claim 1, wherein, In the step 1), each single coking coal and the proportion thereof are as follows: 10% of gas coal, 35% of high-quality 1/3 coking coal, 25% of common 1/3 coking coal, 12% of gas fertilizer coal and 18% of lean reducing coal, or 5% Of gas coal, 38% of high-quality 1/3 coking coal, 25% of common 1/3 coking coal, 12% of gas fertilizer coal and 20% of lean reducing coal, or 10% Of gas coal, 32% of high-quality 1/3 coking coal, 28% of common 1/3 coking coal, 12% of gas fertilizer coal and 18% of lean reducing coal, or 5% Of gas coal, 40% of high-quality 1/3 coking coal, 30% of common 1/3 coking coal, 7% of gas fertilizer coal and 18% of lean coal.
  7. 7. The method of claim 1, wherein, The metallurgical coke obtained by the method has the quality indexes that the sulfur content is less than or equal to 0.70%, the ash content is less than or equal to 13%, the crushing strength M 25 is more than or equal to 90%, the wear resistance M 10 is less than or equal to 8%, the reactivity CRI is less than or equal to 30%, and the strength CSR after reaction is more than or equal to 60%.

Description

Tamping coal blending coking method using 1/3 coking coal as main material Technical Field The invention belongs to the field of coking coal blending in coking industry, and particularly relates to a tamping coal blending coking method mainly using 1/3 coking coal. Background Although the coal resources of China are rich, the high-quality coking coal resources such as coking coal, fat coal and the like are deficient, and the resources such as weakly caking coal, gas coal, 1/3 coking coal and the like are relatively rich. On one hand, the coke productivity in China is huge, the resource consumption of coking coal is too fast, and on the other hand, the large-scale requirement on the quality of the coking coal in a blast furnace is higher and higher, so that the proportions of coking coal, fat coal and the like in a coal blending structure are continuously improved for improving the coke strength. Excessive consumption of high-quality coking coal resources greatly increases the cost of coke raw materials, reduces profits and reduces competitiveness. In order to reduce and slow down the consumption of coking coal and fat coal, adapt to the requirement of long-term development, simultaneously reduce the cost of raw materials of the coke, improve the profit of the coke, and enlarge the utilization rate of resources such as weak caking coal, gas coal, 1/3 coking coal and the like, which are relatively rich in coal. In particular, 1/3 coking coal is distributed in the provinces of Jiangsu, shandong, shanxi, heilongjiang, inner Mongolia autonomous region and the like in China, and has low price and low ash and sulfur index, and the consumption of high-quality coking coal can be effectively relieved by increasing the use amount of 1/3 coking coal, so that the coke cost is reduced. The coking and coal blending method of 1/3 coking coal with 34% or more volatile is disclosed in patent CN 104830360B, wherein the method comprises the steps of carrying out the Kirschner flow measurement on 1/3 coking coal, selecting 1/3 coking coal with a solid-soft temperature range of <70 ℃ as II type 1/3 coking coal, marking 1/3 coking coal with a solid-soft temperature range of >85 ℃ as other 1/3 coking coal, blending 1/3 coking coal with the following mass percentages of 1-10% of gas-rich coal, 1-15% of fat coal, 5-10% of II type 1/3 coking coal, 10-20% of other 1/3 coking coal, 40-45% of coking coal and 10-15% of lean coal. According to the invention, 1/3 coking coal is optimally subdivided by adopting a solid-soft temperature interval in the Kirschner fluidity index, and the purpose of stabilizing the quality of the coking coal can be achieved by assisting in a matched coal blending structure. Patent application CN 111286380A discloses a tamping coking coal blending method for adding high-sulfur 1/3 coking coal, wherein 19% -35% of high-sulfur 1/3 coking coal is blended in a conventional coal blending scheme, so that the quality of coke is ensured, the blending cost is reduced, and the coking coal resource is saved. Patent application CN 101870875B provides a method for producing metallurgical coke by using 1/3 coking coal and non-coking coal, the method comprises the steps of preparing coking coal with the ash content less than or equal to 10%, the sulfur content less than or equal to 0.9%, the volatile content less than or equal to 32.0% and the caking index more than or equal to 65 by using the 1/3 coking coal and the non-coking coal, and producing GB secondary metallurgical coke by using a tamping coking process, thereby realizing comprehensive utilization and resource conversion of local coal resources and improving the economic value of the local coal resources. The technology is researched and applied for 1/3 coking coal, but the 1/3 coking coal resource is not fully utilized, and the cost of the coke is limited. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a method for blending and coking 1/3 coking coal in a large proportion, which realizes the large proportion application of 1/3 coking coal on the premise of ensuring the superior quality of the coking coal, reduces the original cost of the coking coal and saves the high-quality short-cut coking coal resource. In order to achieve the above-mentioned object, The invention provides a coal blending coking method, which comprises the following steps: 1. Mixing various single coking coals, wherein the single coking coals comprise, by weight, 5% -10% of gas coals, 30% -40% of high-quality 1/3 coking coals, 25% -30% of common 1/3 coking coals, 7% -15% of gas fertilizer coals, 15% -25% of lean coking coals, wherein the total amount of 1/3 coking coals is 60% -70%, and the total amount of all single coking coals is 100%; 2. Respectively pre-pulverizing gas coal, gas fat coal and 1/3 coking coal, wherein the ratio of the pre-pulverized gas coal, gas fat coal and 1/3 coking coal is 80% -85%, pulverizing the mixed coal, the ratio of the pulv