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CN-121981764-A - Regional economical coking coal blending method

CN121981764ACN 121981764 ACN121981764 ACN 121981764ACN-121981764-A

Abstract

The invention discloses a functional regional economical coking coal blending method, which is characterized in that on the basis of meeting the quality of metallurgical coke, the functional index dividing method of coking coal resources mainly taking coking functions, bonding functions, ash reduction functions, sulfur reduction functions and volatilization stabilizing functions of coking coal in the coking process is implemented by taking regional and economical principles as principles, and the method for economical blending coal is used for producing high-quality metallurgical coke and meeting the requirements of stable and smooth production and high yield of a blast furnace. The invention effectively solves the problems of the change of the quality of the coking single coal and the production quality of metallurgical coke and the production rigid requirement and control of the coal blending coking production, and effectively solves the problems of the degradation of the internal quality of the coking single coal and the gradual improvement of the smelting strength of the blast furnace, which become progress of the ironmaking industry and the coking industry.

Inventors

  • JIANG XIN
  • WANG XIAOYAN
  • XIE XIAOXIA

Assignees

  • 包头钢铁（集团）有限责任公司

Dates

Publication Date
20260505
Application Date
20251212

Claims (7)

  1. 1. A regional economical coking coal blending method is characterized by comprising the following steps: Step 1, analyzing a coking mechanism of metallurgical coke; step 2, determining metallurgical coke quality requirements and cost control requirements, and determining metallurgical coke quality performance indexes and cost control requirements according to the requirements of self metallurgical coke quality and the requirements on cost control; the metallurgical coke quality technical standard distinguishes different coke production modes of a top-loading coke oven, a tamping coke oven and a heat recovery coke oven; the metallurgical coke quality technical standard should distinguish different coke oven specification modes, especially the carbonization chamber height; the metallurgical coke quality technical standard should distinguish different quenching modes; step 3, determining a reasonable coking coal use area radius; step 4, comprehensively analyzing the performance of coking coal resources in a reasonable area radius; The indexes at least comprise, but are not limited to ash, sulfur, volatile matters, bonding index G, maximum thickness Y of a colloid, strength CSR after reaction, ash component catalysis index MIC, gibbs maximum fluidity alpha max , lithofacies standard deviation SR and Ottem expansion degree b; Step 4, evaluating the functionality of coking coal resources in a reasonable area radius; the coking coal resource functional index mainly comprises coking function, bonding function, ash reduction function, sulfur reduction function and volatilization stabilizing function; Defining the action division of each coking single coal in the integral coal blending in the radius of a reasonable area; Step 5, combining the requirements of metallurgical coke production quality and cost and functional indexes to finely divide coking single coal in the radius of the reasonable area; The coking coal is subdivided into three layers, wherein the first layer is divided into functional indexes, namely coking functional coal, bonding functional coal, ash reduction functional coal, sulfur reduction functional coal and stable volatilization functional coal; The second hierarchical division is based on the classification standard of Chinese coking coal, and the coking coal is divided into 12 major classes of lean coal, lean coal, coking coal, fat coal, 1/3 coking coal, gas fat coal, gas coal, 1/2 medium caking coal, weak caking coal, non-caking coal and long flame coal; Combining the requirements of metallurgical coke production quality and cost and functional indexes to coking single coal subdivision in the radius of the reasonable region, and taking the coking single coal subdivision as a third level of coking coal subdivision; The third level of coking coal subdivision is mainly based on the exerted functional effect under the production quality and cost of metallurgical coke, and is divided into a plurality of categories according to the production requirement, and can be revised and perfected according to the production quality and cost requirement; Step 6, combining the production quality and cost of metallurgical coke, and determining the skeleton coal type, the base coal type and the replacement coal type of the blended coal produced by the coke according to the coking single coal types of the coking single coal functional division; step 7, constructing a coking single coal variety database based on regional principles, dividing the regional principles into fundamental methods based on functional actions and taking coke quality and economical coal blending as principles; Step 8, researching and formulating a coal blending ratio, comprehensively analyzing the steps, and determining a coking coal blending ratio, namely the ratio of each single coal; Step 9, a coal blending ratio verification test, wherein the verification test of the test coke oven is carried out by the proportioning scheme in the step 8; The coal blending ratio verification test is to carry out comprehensive quality detection analysis on smelted metallurgical coke; The indexes of detection and analysis at least comprise ash, sulfur, moisture, thermal performance CRI, CSR, crushing strength M40, wear resistance M10, porosity and pore wall thickness; Step 10, carrying out industrial coke oven tests on the experimentally determined proportions, carrying out mass and detection analysis on smelted coke, adjusting and optimizing a coal blending technical structure according to the coke mass, and determining the final proportions; The indexes of detection and analysis at least comprise ash, sulfur, moisture, thermal performance CRI, CSR, crushing strength M40, wear resistance M10, porosity and pore wall thickness; Step 11, carrying out industrial production according to the finally determined coal blending ratio; Performing carbon performance quality analysis, and performing quality index detection analysis on the produced metallurgical coke; the metallurgical coke quality index at least comprises ash, sulfur, moisture, thermal performance CRI, CSR, crushing strength M40, wear resistance M10, porosity and pore wall thickness performance indexes.
  2. 2. The method for blending regional economic coking coal according to claim 1, wherein the coking mechanism of the metallurgical coking coal in the step 1 is that a colloid body which is generated by gas, solid and liquid in the coal pyrolysis process and coexists with each other has cohesiveness and can be adhered to surrounding solid coal particles to form the colloid body; The interval between the conversion temperature ranges of the colloid bodies which are coexistent with gas, solid and liquid of each single coal of the coking raw material in the pyrolysis process can be mutually overlapped, and the time of the plastic range of the coal in the pyrolysis process is prolonged. Effectively widening the plasticity interval of the blended coal, effectively increasing the yield of the colloid, enabling the surface of the decomposed coal particles to be more fully wetted and fully filled with gaps of the coal particles, and ensuring the quality of coke.
  3. 3. The method for blending regional economic coking coal according to claim 1, wherein in the step 3, the reasonable coking coal use region radius refers to a radiation usable sub-region range taking a production place as a center under the control of coke cost and quality, and the principle is controlled within 800 km of the region radius.
  4. 4. The method for blending regional economic coking coal according to claim 3, further comprising fully and comprehensively examining all coking coal resources within a reasonable regional radius.
  5. 5. The regional economic coking coal blending method of claim 1, wherein the database has a dynamic updating function, and can supplement, revise and perfect a coking single coal variety database according to development and utilization of coal consultation.
  6. 6. The method for blending regional economic coking coal according to claim 1, wherein the step 10 and the step 11 comprise a detection analysis of high-temperature performance of coke, the reaction temperature of the detection analysis of high-temperature performance of coke should not be lower than 1350 ℃, and the reaction temperature of the detection analysis of high-temperature performance of coke is designed to be gradient according to the production condition of a blast furnace and the analysis condition of coke.
  7. 7. The method for blending regional economic coking coal according to claim 1, further comprising the steps of 12 refining experience of achievements, summarizing experience, and solidifying achievements.

Description

Regional economical coking coal blending method Technical Field The invention belongs to the technical field of detection, and particularly relates to a regional economical coking coal blending method. Background Fat coal, coking coal and lean coal resources are important basic coking coal types for producing metallurgical coke, but the whole Chinese coking coal resources are unbalanced, in particular, the proportion of fat coal, coking coal and lean coal resources in the coking coal resources is less than half, and part of high-ash, high-sulfur and difficult-to-wash coal types are also in the fat coal and coking coal resources, so that the production of Chinese high-quality metallurgical coke is more remarkable. However, the steel industry is taken as a support industry of national economy, the requirement on metallurgical coke is a rigid requirement, and the coking coal resource, especially the high-quality coking coal resource such as fat coal, coking coal, lean coal and the like, is reasonably and economically used, meets the basic requirement of the development of the steel industry, is even more urgent, and has great strategic significance for the coking industry and the healthy and sustainable development of the steel industry. Along with the contradiction between the lack of coal resources and the rigid demand of high-quality coking coal resources and the driving of market economic benefits, the coal blending phenomenon in the coking coal market is serious at present, and the apparent index or the basic index (ash, sulfur and volatile matters) is not changed greatly and even completely accords with the Chinese coking coal classification technical standard, but the fundamental property of coking single coal is changed greatly or is not the coking single coal in the Chinese coking coal classification fundamentally, so that the method has a great influence on the correct use of coking single coal, and simultaneously has very adverse restriction on the quality and cost of metallurgical coke, thereby deeply influencing the coal washing and selection and the blending coking technology and the metallurgical coke production, and further influencing the coke and blast furnace production. The change of the coal quality of the coking single coal, the production quality and the cost rigidity requirement and control of the metallurgical coke become difficult problems of the blended coal coking production, and the degradation of the internal quality of the coking single coal and the gradual improvement of the smelting strength of the blast furnace become the biggest problems of the progress of the ironmaking industry and the coking industry. How to face the new economic development situation and the new market change dynamic state, the quality and cost control of coking single coal nature, coking and blending technology and metallurgical coke production are known deeply, the coal blending and the coke refining are well carried out, the structure is stable, the cost is reduced, and stable and high-quality raw materials are provided for the blast furnace. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a regional economical coking coal blending method. The basic principle and idea are explained as follows: basic principle and thought 1, on the basis of meeting the quality of metallurgical coke, regionality and economy should be the important principles followed for coal blending coking. Basic principle and thought 2, the basic properties (moisture, ash, volatile matters, sulfur and caking index) of the coking single coal cannot be adapted and met at present, and the requirements of the performance evaluation of the coking single coal, the coking blending and the production are met. The basic principle and the thought 3 are that the indexes of the thermal state performance (the reactive CRI and the strength after reaction CSR) of the coke are centralized and objectively reflect the intrinsic quality of the metallurgical coke, particularly the characterization of the melting loss behavior of the blast furnace smelting coke in the blast furnace, thereby having great influence on the modern blast furnace smelting process, becoming a key factor for restricting the stable, balanced, high-quality and high-efficiency production of molten iron of the blast furnace, and the knowledge of the importance and the parameter index dependence of the ironmaking and coking industries on the important degree are not achieved. The basic principle and the thought 4 are that the core function of single coal in coking and blending is balanced in quantity and quality of colloid in the coking process. Basic principle and thought 5, the functional index performance of coking single coal should comprehensively reflect the inherent core quality and functional effect of coking coal. Basic principle and thought 6, the essence and core of the regional principle of coking single coal is that the comp