Coal blending method for replacing fat coal in Shanxi region with high-sulfur high-strength low-ash-content one third coking coal in Wuhai region

Abstract

The invention discloses a coal blending method for replacing fat coal in Shanxi region with high-sulfur high-strength low-ash-content one-third coking coal in Wuhai region. The coal blending method comprises the following steps: step 1, performing classification and grading on the fat coal in Shanxi region according to regional distribution and index properties of the fat coal in Shanxi region; 2, determining metallurgical coke quality requirements and cost control; 3, comprehensively analyzing the properties of the replaced Shanxi fat coal; 4, comprehensively analyzing the properties of the black sea 1 / 3 coking coal; 5, analyzing the properties of each single coal used for coking coal blending; step 4, coal blending ratio adjustment; 5, carrying out a coal blending ratio verification test; step 6, carbon performance quality analysis; and 7, verifying the use effect of the blast furnace. The application of the invention expands the coking coal resources, saves and protects the high-quality coking coal, optimizes the coal blending technical structure, reduces the coking coal blending cost, and generates huge economic benefits and good social benefits.

Description

Technical Field

[0001] The invention relates to a coal blending method in which one third of coking coal from Wuhai area replaces fat coal from Shanxi area with high-sulfur, high-strength and low-ash coking coal. Background Art

[0002] The types of coal with certain coal quality characteristics, special properties and important economic value, and relatively small reserves are "special and scarce coal", including fat coal, coking coal, lean coal, etc. Fat coal, coking coal and lean coal resources are important raw materials for the production of metallurgical coke. Among the fat coal and coking coal resources, there are some high-ash, high-sulfur and difficult-to-wash coal types. Shanxi coking coal, fat coal and lean coal are world-famous high-quality coal sources for coking, and are also "special and scarce coal". In view of the severe situation of the continuous depletion of "special and scarce coal" (fat coal, coking coal, lean coal) resources for coke production, how to save and use the "special and scarce coal" (fat coal, coking coal, lean coal) resources in Shanxi, especially the particularly scarce and increasingly depleted fat coal, is even more urgent, and has great strategic significance for the healthy and sustainable development of the coking industry and even the steel industry. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a coal blending method in which one-third of Wuhai coking coal with high sulfur content, high post-reaction strength and low ash content replaces Shanxi fat coal.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention discloses a coal blending method for replacing fat coal from Shanxi region with one-third of coking coal from Wuhai region with high sulfur, high strength and low ash content, comprising the following steps:

[0006] Step 1: Classify and grade Shanxi fat coal according to its regional distribution and index properties. Shanxi fat coal is divided into 4 grades from high to low according to its properties and quantity indicators, namely: super special grade, special grade, excellent grade, and ordinary grade. The classification technical indicators are shown in Table 1:

[0007] Table 1 Technical indicators of Shanxi fat coal classification

[0008]

[0009] Step 2: Determine the quality requirements and cost control of metallurgical coke. Determine the quality performance indicators and cost control requirements of metallurgical coke according to the quality requirements of metallurgical coke and the requirements for cost control;

[0010] Step 3: Comprehensively analyze the properties of the Shanxi fat coal to be replaced, and its indicators include at least: ash content, sulfur content, volatile content, bonding index G, maximum thickness of colloid Y, post-reaction strength CSR, ash component catalytic index M IC, Gibbs maximum fluidity α max, lithofacies standard deviation SR and Oya expansion degree b;

[0011] Step 4: Comprehensively analyze the properties of Wuhai 1 / 3 coking coal, and its indicators include at least: ash content, sulfur content, volatile matter, bonding index G, maximum thickness of colloid Y, post-reaction strength CSR, ash component catalytic index M IC, Gibbs maximum fluidity α max , lithofacies standard deviation SR and Oya expansion degree b;

[0012] Step 5, analyzing the properties of each type of coal used in coking coal blending, comprehensively analyzing the performance indicators of each type of coal used in coking coal blending, especially the indicators of coking and coking properties of each type of coal, and reasonably utilizing the coking and coking properties of each type of coal;

[0013] Step 4, adjusting the coal blending ratio, comprehensively analyzing the above steps to determine the coking coal blending ratio, that is, the ratio of each single type of coal used;

[0014] Step 5, coal blending ratio verification test, the blending ratio scheme in step 4 is subjected to a verification test in a test coke oven;

[0015] Step 6, carbon performance quality analysis, to carry out quality index detection and analysis on the produced metallurgical coke, including at least ash content, sulfur content, moisture content, thermal properties CRI, CSR, crushing strength M40, wear resistance M10, porosity, pore wall thickness and other performance indicators;

[0016] Step 7, blast furnace use effect verification, the produced metallurgical coke is used to verify the blast furnace use effect to see if it meets the blast furnace production requirements;

[0017] Step 8: Solidify the experience gained from the achievements, summarize the experience, and solidify the achievements.

[0018] Further, in step 2:

[0019] The control requirements of metallurgical coke quality performance indicators should be based on the stable and high production of blast furnaces of different volumes;

[0020] The control requirements of metallurgical coke quality performance indicators need to fully consider the resources as well as the capacity and status of coke oven gas treatment.

[0021] Furthermore, in step 4:

[0022] Analyze the sulfur content (St,d) of Wuhai 1 / 3 coking coal, the sulfur occurrence state and the content of each occurrence state;

[0023] The occurrence state of sulfur content in high-sulfur coal mainly refers to organic sulfur and inorganic sulfur;

[0024] The sulfur content of high-sulfur coal requires determination of the composition types and main types of organic sulfur and inorganic sulfur.

[0025] Furthermore, in step 5:

[0026] The coal blending ratio verification test shall conduct a comprehensive quality inspection and analysis of the metallurgical coke produced. The inspection and analysis indicators shall at least include ash content, sulfur content, moisture content, thermal properties CRI and CSR, crushing strength M40, wear resistance M10, porosity, and pore wall thickness;

[0027] The coal blending ratio verification test requires effective collection of coal gas from the smelting process, testing of its gas composition, and focusing on testing the content of hydrogen sulfide in the gas;

[0028] The experimentally determined ratio will be used to carry out industrial coke oven tests, and the quality and inspection analysis of the smelted coke will be carried out. The coal blending technology structure will be adjusted and optimized according to the coke quality, and the final ratio will be determined.

[0029] Furthermore, in step 7: the blast furnace effect verification focuses on blast furnace output, blast furnace utilization coefficient, and blast furnace fuel ratio.

[0030] Compared with the prior art, the beneficial technical effects of the present invention are:

[0031] The present invention provides a technical solution for a coal blending method in which one-third of Wuhai high-sulfur, high-reaction-strength and low-ash coking coal replaces Shanxi fat coal, which solves the technical problem of how to save and use the "special and scarce coal" (fat coal, coking coal, lean coal) resources in Shanxi, especially the extremely scarce and increasingly depleted fat coal. The application of the present invention expands coking coal resources, saves and protects high-quality coking coal, optimizes the coal blending technical structure, reduces the cost of coking coal blending, and produces huge economic benefits and good social benefits. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0033] A coal blending method for replacing fat coal from Shanxi region with one-third of coking coal from Wuhai region with high sulfur, high strength and low ash content comprises the following steps:

[0034] Step 1: Classify and grade Shanxi fat coal according to its regional distribution and index properties, that is, Shanxi fat coal is divided into 4 grades from high to low according to its properties and quantity, namely, super special grade, special grade, excellent grade and ordinary grade. The classification technical indicators are shown in Table 2 below.

[0035] Table 2 Technical indicators of Shanxi fat coal classification

[0036]

[0037] Step 2: Determine the quality requirements and cost control of metallurgical coke. Determine the quality performance indicators and cost control requirements of metallurgical coke according to the quality requirements of metallurgical coke and the requirements for cost control;

[0038] Step 3: Comprehensively analyze the properties of the Shanxi fat coal to be replaced, including at least, but not limited to, ash content, sulfur content, volatile matter, bonding index (G), maximum thickness of colloid (Y), strength after reaction (CSR), ash component catalytic index (MIC), Gibbs maximum fluidity (α max ), lithofacies standard deviation (SR) and Oya expansion (b).

[0039] Step 4: comprehensively analyze the properties of Wuhai 1 / 3 coking coal, including at least, but not limited to, ash content, sulfur content, volatile matter, bonding index (G), maximum thickness of colloid (Y), strength after reaction (CSR), ash component catalytic index (MIC), Gibbs maximum fluidity (α max ), lithofacies standard deviation (SR) and Oya expansion (b).

[0040] Step 5: Analyze the properties of each type of coal used in coking coal blending, comprehensively analyze the performance indicators of each type of coal used in coking coal blending, especially the indicators of coking and coking properties of each type of coal, and reasonably utilize the coking and coking properties of each type of coal.

[0041] Step 4, adjusting the coal blending ratio, comprehensively analyzing the above steps to determine the coking coal blending ratio, that is, the ratio of each single type of coal used;

[0042] Step 5, coal blending ratio verification test, the blending ratio scheme in step 4 is subjected to a verification test in a test coke oven;

[0043] Step 6, carbon performance quality analysis, to carry out quality index detection and analysis on the produced metallurgical coke, including at least ash content, sulfur content, moisture, thermal properties (CRI, CSR), crushing strength (M40), wear resistance (M10), porosity, pore wall thickness and other performance indicators;

[0044] Step 7, blast furnace use effect verification, the produced metallurgical coke is used to verify the blast furnace use effect to see if it meets the blast furnace production requirements;

[0045] Step 8: Solidify the experience gained from the achievements, summarize the experience, and solidify the achievements.

[0046] Further, in step 2:

[0047] The control requirements of metallurgical coke quality performance indicators should be based on the stable and high production of blast furnaces of different volumes;

[0048] The control requirements of metallurgical coke quality performance indicators need to fully consider the resources as well as the capacity and status of coke oven gas treatment.

[0049] Furthermore, in step 4:

[0050] Analyze the sulfur content (St,d) of Wuhai 1 / 3 coking coal, the sulfur occurrence state and the content of each occurrence state;

[0051] The occurrence state of sulfur content in high-sulfur coal mainly refers to organic sulfur and inorganic sulfur;

[0052] The sulfur content of high-sulfur coal requires determination of the composition types and main types of organic sulfur and inorganic sulfur.

[0053] Furthermore, in step 5:

[0054] The coal blending ratio verification test shall conduct comprehensive quality inspection and analysis on the metallurgical coke produced. The inspection and analysis indicators shall at least include ash content, sulfur content, moisture content, thermal properties (CRI, CSR), crushing strength (M40), wear resistance (M10), porosity, and pore wall thickness;

[0055] The coal blending ratio verification test requires effective collection of coal gas from the smelting process, testing of its gas composition, and focusing on testing the content of hydrogen sulfide in the gas;

[0056] The experimentally determined ratio will be used to carry out industrial coke oven tests, and the quality and inspection analysis of the smelted coke will be carried out. The coal blending technology structure will be adjusted and optimized according to the coke quality, and the final ratio will be determined.

[0057] Furthermore, in step 7: the blast furnace effect verification focuses on blast furnace output, blast furnace utilization coefficient, and blast furnace fuel ratio.

[0058] In the case of a sluggish coke market and a significant reduction in profitability, a coking enterprise, in order to reduce the cost of coking coal blending, thereby reducing coke manufacturing costs and promoting increased corporate benefits, used the technology of the present invention to replace Shanxi fat coal with one-third of coking coal from the Wuhai area with high-sulfur, high-strength and low-ash content. Under the premise of ensuring the quality of coke, the cost of coking coal blending was reduced through the application of patented technology to increase corporate benefits.

[0059] According to the coal structure of this enterprise and the quality of Shanxi fat coal, Shanxi fat coal is classified and graded according to this patented technology, and the high-grade Shanxi fat coal is replaced.

[0060] The requirements of our company for metallurgical coke quality and cost control are shown in Table 3

[0061] Table 3 Coke quality requirements and cost control requirements

[0062] Coke quality Ad St,d M40 M10 CRI CSR 12.8 0.85 89.0 5.5 22.5 66.5

[0063] The cost control requirement is that the cost price of the blending coal for the above-mentioned coke quality requirements shall not be higher than the industry average price, with the goal of reducing the industry average blending coal price by 5-8%.

[0064] A comprehensive test and analysis was conducted on the properties of the replaced Shanxi fat coal and Wuhai 1 / 3 coking coal, and the occurrence state of sulfur and the content of each occurrence state were analyzed. The indicators are shown in Tables 4 and 5.

[0065] Table 4 Properties of Shanxi fat coal and Wuhai 1 / 3 coking coal

[0066]

[0067] Table 5 Analysis of sulfur occurrence in Wuhai 1 / 3 high sulfur coking coal

[0068]

[0069] From the analysis of various test indicators, Wuhai 1 / 3 coking coal has low ash content, high sulfur content, good coke thermal properties, and is a high thermal strength coking coal with good bonding properties. From the market price analysis, the price difference between the two types of coal is between 200-260 yuan / ton. Through the performance matching between each type of coal, it has the ability to completely replace the high-priced Shanxi fat coal. Its good bonding and thermal properties are the basic and necessary conditions for substitution.

[0070] According to the company's coking coal resources, coke quality requirements and cost control requirements, the performance indicators of each type of coking coal are comprehensively analyzed, especially the indicators of adhesion and coking properties of each type of coal, so as to rationally utilize the adhesion and coking properties of each type of coal.

[0071] The company's coke quality requirements and the properties of each type of coking coal are shown in Tables 6 and 7 respectively.

[0072] Table 6 Metallurgical coke quality requirements

[0073] Project Name Ad St,d M40 M10 CRI CSR Industrial trials ≤12.80 ≤0.90 ≥88.0 ≤6.0 ≤23.5 ≥66.5

[0074] Table 7 Performance indicators of single coal

[0075]

[0076] Comprehensively analyzing the above steps, the coking coal ratio is determined to ensure that the coking coal cost is controllable on the basis of ensuring the quality of coke. The coal blending technical plan is shown in Table 8.

[0077] Table 8 Experimental design (%)

[0078]

[0079]

[0080] After carefully analyzing the properties of the single type of coal for coking in the coking enterprise and the properties of 1 / 3 high-sulfur coking coal in Wuhai, three sets of technical solutions were determined on the basis of ensuring the quality requirements of metallurgical coke.

[0081] The above-mentioned proportioning scheme is subjected to verification test in the experimental coke oven, and the quality index detection and analysis of the produced metallurgical coke are carried out, including at least ash content, sulfur content, moisture, thermal properties (CRI, CSR), crushing strength (M40), wear resistance (M10), porosity, pore wall thickness and other performance indicators.

[0082] Table 9 Mechanical properties and hot strength test data of metallurgical coke in different schemes

[0083] Project Name Basic plan Solution 1 Solution 2 Solution 3 M40 88.5 89.0 89.5 90.0 M10 5.8 6.0 5.6 5.5 CRI 23.2 23.5 22.6 23.0 CSR 67.8 67.2 68.5 68.7 Ad 12.87 12.85 12.82 12.85 St,d 0.87 0.88 0.89 0.89 Porosity 46.7 47.9 45.8 46.2 Pore ​​wall thickness 131 115 125 138

[0084] From the analysis of the technical indicators in the above table, Technical Scheme 1, Technical Scheme 2 and Technical Scheme 3 can all meet the predetermined coke quality requirements. Scheme 3 completely replaced Shanxi fat coal. By increasing fat coal 1, Mongolian coking coal and 1 / 3 coking coal and reducing lean coal, the ash content and sulfur content of coke were controlled, and the sulfur content did not exceed the standard. The thermal properties of coke and the thickness of the coke pore wall were improved and enhanced. This has confirmed in practice that Wuhai 1 / 3 high sulfur can completely replace Shanxi fat coal. Calculated based on the market price of coking coal at that time, the coal blending cost was reduced by 6.5 yuan / ton to 12.3 yuan / ton.

[0085] According to the above test process and analysis of test data, and comprehensive consideration of the production coal blending process, Scheme 3 was selected as the industrial test scheme.

[0086] The ratio determined in the experiment was used for industrial coke oven test, and the quality and test analysis of the smelted coke was carried out. In this coking plant, Scheme 3 was adopted as the industrial technical scheme, and a carbonization chamber was used in a 7-meter top-loading coke oven to mix coal according to Scheme 3. According to the coke oven production control parameters, industrial tests were carried out, and metallurgical coke was tested and analyzed. The quality index test data are shown in Table 10.

[0087] Table 10 Quality inspection indicators of metallurgical coke in industrial test of Scheme 1

[0088]

[0089] The produced metallurgical coke was used to verify the effect of blast furnace use, which fully met the blast furnace production needs. The blast furnace fuel ratio was reduced by 1.7Kg / ton, the blast furnace utilization coefficient was stable, and the blast furnace condition was stable and smooth.

[0090] Continuously accumulate data, summarize experience, and consolidate results.

[0091] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A coal blending method in which one-third of coking coal from Wuhai replaces fat coal from Shanxi with high-sulfur, high-strength and low-ash coking coal, characterized in that: The steps include: Step 1: Classify and grade Shanxi fat coal according to its regional distribution and index properties. Shanxi fat coal is divided into 4 grades from high to low according to its properties and quantity indicators, namely: super special grade, special grade, excellent grade, and ordinary grade. The classification technical indicators are as follows: Step 2: Determine the quality requirements and cost control of metallurgical coke. Determine the quality performance indicators and cost control requirements of metallurgical coke according to the quality requirements of metallurgical coke and the requirements for cost control; Step 3: Comprehensively analyze the properties of the Shanxi fat coal to be replaced, and its indicators include at least: ash content, sulfur content, volatile content, bonding index G, maximum thickness of colloid Y, post-reaction strength CSR, ash component catalytic index MIC, Gibbs maximum fluidity α max , lithofacies standard deviation SR and Oya expansion degree b; Step 4: Comprehensively analyze the properties of Wuhai 1 / 3 coking coal, and its indicators include at least: ash content, sulfur content, volatile content, bonding index G, maximum thickness of colloid Y, post-reaction strength CSR, ash component catalytic index MIC, Gibbs maximum fluidity α max , lithofacies standard deviation SR and Oya expansion degree b; Step 5, analyzing the properties of each type of coal used in coking coal blending, comprehensively analyzing the performance indicators of each type of coal used in coking coal blending, especially the indicators of coking and coking properties of each type of coal, and reasonably utilizing the coking and coking properties of each type of coal; Step 4, adjusting the coal blending ratio, comprehensively analyzing the above steps to determine the coking coal blending ratio, that is, the ratio of each single type of coal used; Step 5, coal blending ratio verification test, the blending ratio scheme in step 4 is subjected to a verification test in a test coke oven; Step 6, carbon performance quality analysis, to carry out quality index detection and analysis on the produced metallurgical coke, including at least ash content, sulfur content, moisture content, thermal properties CRI, CSR, crushing strength M40, wear resistance M10, porosity, pore wall thickness performance indicators; Step 7, blast furnace use effect verification, the produced metallurgical coke is used to verify the blast furnace use effect to see if it meets the blast furnace production requirements; Step 8: Solidify the experience gained from the achievements, summarize the experience, and solidify the achievements.

2. The coal blending method of replacing fat coal in Shanxi region with one-third of coking coal in Wuhai region with high sulfur, high strength and low ash according to claim 1 is characterized by: In the step 2: The control requirements of metallurgical coke quality performance indicators should be based on the stable and high production of blast furnaces of different volumes; The control requirements of metallurgical coke quality performance indicators need to fully consider the resources as well as the capacity and status of coke oven gas treatment.

3. The coal blending method of claim 1, wherein one-third of the coking coal from Wuhai replaces the fat coal from Shanxi, and is characterized in that: In step 4: Analyze the sulfur content (St,d) of Wuhai 1 / 3 coking coal, the sulfur occurrence state and the content of each occurrence state; The occurrence state of sulfur content in high-sulfur coal mainly refers to organic sulfur and inorganic sulfur; The sulfur content of high-sulfur coal requires determination of the composition types and main types of organic sulfur and inorganic sulfur.

4. The coal blending method of replacing Shanxi fat coal with one-third of coking coal from Wuhai with high sulfur, high strength and low ash according to claim 1 is characterized by: In step 5: The coal blending ratio verification test shall conduct a comprehensive quality inspection and analysis of the metallurgical coke produced. The inspection and analysis indicators shall at least include ash content, sulfur content, moisture content, thermal properties CRI and CSR, crushing strength M40, wear resistance M10, porosity, and pore wall thickness; The coal blending ratio verification test requires effective collection of coal gas from the smelting process, testing of its gas composition, and focusing on testing the content of hydrogen sulfide in the gas; The experimentally determined ratio will be used to carry out industrial coke oven tests, and the quality and inspection analysis of the smelted coke will be carried out. The coal blending technology structure will be adjusted and optimized according to the coke quality, and the final ratio will be determined.

5. The coal blending method of replacing fat coal in Shanxi region with one third of coking coal in Wuhai region with high sulfur, high strength and low ash according to claim 1 is characterized by: In step 7: the blast furnace effect verification focuses on blast furnace output, blast furnace utilization coefficient, and blast furnace fuel ratio.

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