A high-quality coke blending method and high-quality coke

Abstract

The invention discloses a high-quality coke blending method and high-quality coke, the method comprising the following steps: preparing a fusion material of asphalt powder and dust-removed coke powder, blending coal, adding crushed material, crushing, coking, and cooling coke; a high-quality coke, the coke reaction strength CSR is greater than 65.5%, the crushing strength M 40 All are greater than 85%, the reaction index CRI is less than 25%, and the wear resistance M 10 The ash content of the high-quality coke produced by the high-quality coke blending method is less than 12%, the total sulfur content is less than 0.70%, the strength after reaction CSR is greater than 65.5%, and the crushing strength M 40 All are greater than 85%, the reaction index CRI is less than 25%, and the wear resistance M 10 Both are less than 6%.

Description

Technical Field

[0001] The invention relates to high-quality coke and a coking method, and in particular to a high-quality coke coal blending coking method and high-quality coke. Background Art

[0002] my country's coking coal reserves are about 258.4 billion tons, accounting for 28% of the total coal reserves, of which gas coal, the largest in reserves, accounts for 57% of my country's coking coal reserves, fat coal accounts for 14.46%, coking coal accounts for 16.89%, and lean coal accounts for 12.38%. Although there are a full range of coking coal varieties, their distribution is uneven. With the rapid development of the coking industry, the shortage of coking coal and the rise in prices have become one of the main factors affecting the cost of coke production.

[0003] In terms of coking technology, with the increasing attention paid by domestic large and medium-sized coking enterprises to energy conservation and environmental protection, coke quality improvement, and high value-added utilization of weakly sticky coal, the construction of dry coke quenching equipment has become an important trend in the development of the industry. Compared with traditional wet coke quenching technology, dry coke quenching technology has significant advantages in energy conservation, environmental protection, improving coke quality, and economic benefits. However, during the quenching process in the dry quenching furnace, due to the mutual displacement and friction between cokes and the burning of coke, a certain amount of dusted coke powder will be produced, and the output of these coke powders accounts for about 2% to 3% of the total coke output. Because of its large amount and difficulty in realizing high-value utilization, dusted coke powder is usually processed at a lower price and given to sintering and furnace charge companies as fuel.

[0004] Therefore, it is of great significance to realize the high added value utilization of CDQ dedusted coke powder in the coking system. In domestic theoretical research and production practice, dedusted coke powder can be used as a thinning agent for coal blending and coking. For example, the Chinese patent publication number: CN102942944 B, a method for coking coal blending in which one-third of Anhui coking coal is involved, adds 1% to 2% CDQ dedusted powder for coal blending and coking, and the coke quality indicators are: crushing strength M 40 Greater than 85%, wear resistance M 10 Less than 6.8%, and the strength after reaction CSR is greater than 65.5%; For example, the Chinese patent publication number: CN 110819364 A is a method for preparing metallurgical coke, in which waste resin and dry quenching dust powder are fully mixed and formed into balls according to a mass ratio of 1:1~1:5, and the mass percentage of the mixed balls is 1%~5%, which improves the mechanical strength index M of the coke. 40 Increased to 1~5 percentage points, 200kg small coke oven M 40The carbon content of coke is increased to 65%, and the strength of coke after reaction is increased to 56.5%, which improves the product performance indicators; for example, the Chinese patent publication number is: CN 116396771 A, a method and device for coking with CDQ powder and coal, adding 1% to 3% CDQ powder for coking, can make the ash content of coke reach below 13%, the sulfur content reach below 0.95%, the strength after reaction reach above 61%, the reaction index reach below 28%, the crushing strength reach above 85%, and the wear resistance reach below 6.8%.

[0005] Dust-removed coke powder has low volatile matter and moisture content, high fixed carbon content, and almost no adhesiveness. When mixed with blended coal for coking, the amount of blending must be strictly controlled. Too high a blending amount will affect the quality of coking coal. According to research, the maximum blending amount of dust-removed coke powder in existing coking technology is 3%. However, with the continuous increase in the size of coking coke ovens, the output of dust-removed coke powder has increased significantly. Therefore, a technology that increases the blending amount of dust-removed coke powder in the blended coal coking process without affecting the quality of coke can effectively solve the problem of increased dust-removed coke powder output. Summary of the invention

[0006] In order to solve the above technical problems, the first purpose of the present invention is to provide a method for coking high-quality coke by blending coal, by crushing the asphalt and mixing it with dust-removed coke powder, heating the prepared mixed powder, melting it, cooling it, and coarsely crushing it to obtain a crushed material, which is blended into the blended coal and then coking is carried out, thereby effectively solving the problem of the quality of coke affected by excessive blending of dust-removed coke powder.

[0007] The second object of the present invention is to provide a high-quality coke.

[0008] The first object of the present invention is implemented by the following technical solutions:

[0009] A method for coking high-quality coke by coal blending comprises the following steps:

[0010] (1) crushing the asphalt and passing it through a sieve with a pore size of 3 mm to obtain asphalt powder;

[0011] (2) Mixing asphalt powder and dust-removed coke powder evenly in a mass ratio of 1:1 to 1:2 to obtain a mixed powder;

[0012] (3) heating the obtained mixed powder to 160°C to 200°C to melt it, and then cooling it to obtain a fusion material;

[0013] (4) coarsely crushing the obtained fused material to obtain crushed material;

[0014] (5) Each type of coal is blended according to the following mass proportions, totaling 100 parts, to obtain blended coal: 17 to 23 parts of 1 / 2 medium-coking coal, 15 to 20 parts of gas coal, 30 to 40 parts of coking coal A, 4 to 6 parts of fat coal, 6 to 10 parts of coking coal B, 3 to 5 parts of coking coal C, and 8 to 12 parts of lean coal;

[0015] (6) The crushed material is pre-mixed with the blended coal to prepare a coking mixture, and the mass ratio of the crushed material to the blended coal is 1:9~1:4;

[0016] (7) crushing the obtained coking mixture to obtain coking powder;

[0017] (8) using a tamping machine to make briquettes from the obtained coking powder;

[0018] (9) Coking: the prepared coal cakes are put into a coke oven for coking at a coking temperature of 1315°C to 1335°C and a coking time of 26.5h to 30h;

[0019] (10) The mature coke is loaded into a dry quenching furnace for quenching to obtain finished coke.

[0020] Preferably, in step (2), the ash yield of asphalt powder (A d ) is 1%~3%, volatile matter (V daf ) is 58%~68%, and the total sulfur content (S t,d ) is 0.4%~0.7%, and the adhesion G value is 86~95;

[0021] The ash yield of dust-removed coke powder is 10%~12%, the volatile matter is 0.5%~0.7%, the total sulfur content is 0.8%~0.9%, and it has no adhesiveness.

[0022] Preferably, in step (5), the ash yield of 1 / 2 of the sticky coal is 5% to 7%, the volatile matter is 28% to 35%, the total sulfur content is 0.4% to 0.6%, and the cohesiveness G value is ≥10.00;

[0023] The ash yield of gas coal is 9%~11%, the volatile matter is 35%~38%, the total sulfur content is 0.4%~0.6%, the thickness of the colloid layer Y value is 14mm~23mm, and the G value is 65~70;

[0024] The ash yield of coking coal A is 9%~11%, the volatile matter is 20%~28%, the total sulfur content is 0.5%~0.7%, the Y value is 15mm~25mm, and the G value is 65~80;

[0025] The ash yield of fat coal is 10%~13%, the volatile matter is 28%~35%, the total sulfur content is 0.8%~1.0%, the Y value is ≥21mm, and the G value is ≥85;

[0026] The ash yield of coking coal B is 9%~11%, the volatile matter is 20%~28%, the total sulfur content is 1.6%~2.1%, the Y value is 15mm~25mm, and the G value is ≥65;

[0027] The ash yield of coking coal C is ≤9%, the volatile matter is 20%~30%, the total sulfur content is 2.4%~2.7%, the Y value is 15mm~25mm, and the G value is ≥65;

[0028] The ash yield of lean coal is 9%~11%, the volatile matter is 15%~20%, the total sulfur content is 0.5%~0.7%, there is no clear requirement for the Y value, and the G value is 50~65.

[0029] Preferably, in step (7), the mass percentage of the coking powder with a particle size of less than 3.0 mm accounts for 86.0% to 90.0%, of which 1 mm to 3 mm accounts for 23.5% to 30.0%, 0.5 mm to 1.0 mm accounts for 8.2% to 17.2%, and less than 0.5 mm accounts for 43.0% to 56.0%.

[0030] The second object of the present invention is implemented by the following technical solution: high-quality coke is prepared by the coal blending and coking method for high-quality coke described in the first object of the present invention.

[0031] Preferably, the coke reaction strength CSR is greater than 65.5%, and the crushing strength M 40 All are greater than 85%, the reaction index CRI is less than 25%, and the wear resistance M 10 Both are less than 6%.

[0032] Advantages of the present invention:

[0033] The present invention adds asphalt to prepare a fusion material of asphalt powder and dust-removing coke powder, and mixes it with matching coal for coking, so that the mixing amount of dust-removing coke powder can be increased to 10%, and high-quality coke can be prepared, so that the ash content of the coke reaches less than 12%, the total sulfur reaches less than 0.70%, the strength after reaction CSR is greater than 65.5%, and the crushing strength M 40 All are greater than 85%, the reaction index CRI is less than 25%, and the wear resistance M 10 Both are less than 6%. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The present embodiment mainly aims at increasing the blending amount of dust-removed coke powder in the process of coking with coal without affecting the quality of coke, and solves the problem of dust-removed coke powder affecting the quality of coke due to its almost non-adhesiveness by preparing a fusion material of asphalt powder and dust-removed coke powder and blending it with blended coal for coking, thereby proposing a method for coking with coal for high-quality coke and high-quality coke.

[0036] Example:

[0037] As shown in Tables 1 to 3, a method for coking high-quality coke by blending coal comprises the following steps:

[0038] (1) crushing the asphalt and passing it through a sieve with a pore size of 3 mm to obtain asphalt powder. The asphalt can be coal asphalt, petroleum asphalt or natural gas asphalt. In this embodiment, coal asphalt is used;

[0039] (2) The asphalt powder and the dust-removed coke powder are mixed evenly to prepare a mixed powder. The performance parameters of the asphalt powder and the dust-removed coke powder are shown in Table 1, and the mass ratio of the asphalt powder and the dust-removed coke powder is shown in Table 3;

[0040] (3) heating the obtained mixed powder to 180° C. to melt it, and then cooling it to obtain a fused material;

[0041] (4) coarsely crushing the obtained fusion material to a particle size of the matching coal to obtain crushed material;

[0042] (5) Each type of coal is blended according to the following mass proportions, totaling 100 parts, to obtain blended coal: 21 parts of 1 / 2 medium-caking coal, 17 parts of gas coal, 35 parts of coking coal A, 5 parts of fat coal, 8 parts of coking coal B, 4 parts of coking coal C, and 10 parts of lean coal. There is no difference in the coking and coking properties of coking coal A, coking coal B, and coking coal C. The main difference lies in the ash yield and total sulfur content. The use of three types of coking coal at the same time can reduce the cost of coal blending while ensuring that the ash and sulfur of the coking mixture meet the standards. The performance parameters of each type of coal are shown in Table 2;

[0043] (6) Crushed material is pre-mixed with blended coal to prepare coking mixture. The mass ratio of crushed material to blended coal is shown in Table 3.

[0044] (7) The obtained coking mixture is crushed to obtain coking powder, wherein the mass of the coking powder has a particle size of less than 3.0 mm accounting for 86.0% to 90.0%, of which 1 mm to 3 mm accounts for 23.5% to 30.0%, 0.5 mm to 1.0 mm accounts for 8.2% to 17.2%, and less than 0.5 mm accounts for 43.0% to 56.0%;

[0045] (8) using a tamping machine to make briquettes from the obtained coking powder;

[0046] (9) Coking: the prepared coal cakes are loaded into a coke oven for coking at a coking temperature of 1315°C to 1335°C and a coking time of 30 hours;

[0047] (10) The mature coke is loaded into a dry quenching furnace for quenching to obtain finished coke.

[0048] The high-quality coke prepared by the above-mentioned high-quality coke blending and coking method has performance parameters as shown in Table 3.

[0049] Comparative Example 1:

[0050] As shown in Tables 1 to 2 and 4, a method for coking by blending coal for coking comprises the following steps:

[0051] (1) Each type of coal is blended according to the following mass proportions, totaling 100 parts, to obtain blended coal: 21 parts of 1 / 2 medium-coking coal, 17 parts of gas coal, 35 parts of coking coal A, 5 parts of fat coal, 8 parts of coking coal B, 4 parts of coking coal C, and 10 parts of lean coal. The performance parameters of each type of coal are shown in Table 2;

[0052] (2) Dust-removed coke powder is added to the blended coal. The performance parameters of the dust-removed coke powder are shown in Table 1.

[0053] (3) The blended coal mixed with dust-removed coke powder is crushed to obtain coking powder, of which the mass of the coking powder has a particle size of less than 3.0 mm accounting for 86.0% to 90.0%, of which 1 mm to 3 mm accounts for 23.5% to 30.0%, 0.5 mm to 1.0 mm accounts for 8.2% to 17.2%, and less than 0.5 mm accounts for 43.0% to 56.0%;

[0054] The mass proportion of dust-removed coke powder in coking powder is shown in Table 4;

[0055] (4) using a tamping machine to make briquettes from the obtained coking powder;

[0056] (5) Coking: the prepared coal cakes are loaded into a coke oven for coking at a coking temperature of 1315°C to 1335°C and a coking time of 30 hours;

[0057] (6) The mature coke is loaded into a dry quenching furnace for quenching to obtain finished coke.

[0058] The performance parameters of the coke prepared by the above-mentioned coke blending and coking method are shown in Table 4.

[0059] Comparative Example 2:

[0060] As shown in Tables 1 to 2 and 5, a method for coking by blending coal for coking comprises the following steps:

[0061] (1) crushing the asphalt and passing it through a sieve with a pore size of 3 mm to obtain asphalt powder. The asphalt can be coal asphalt, petroleum asphalt or natural gas asphalt. In this comparative example, coal asphalt is used;

[0062] (2) The asphalt powder and the dust-removed coke powder are mixed evenly to prepare a mixed powder. The performance parameters of the asphalt powder and the dust-removed coke powder are shown in Table 1, and the mass ratio of the asphalt powder and the dust-removed coke powder is shown in Table 5;

[0063] (3) Each type of coal is blended according to the following mass proportions, totaling 100 parts, to obtain blended coal: 21 parts of 1 / 2 medium-coking coal, 17 parts of gas coal, 35 parts of coking coal A, 5 parts of fat coal, 8 parts of coking coal B, 4 parts of coking coal C, and 10 parts of lean coal. The performance parameters of each type of coal are shown in Table 2;

[0064] (4) Mixed powder is added to the blended coal. The mass ratio of the mixed powder to the blended coal is shown in Table 5;

[0065] (5) The blended coal mixed with the mixed powder is crushed to obtain coking powder, wherein the mass of the coking powder has a particle size of less than 3.0 mm accounting for 86.0% to 90.0%, of which 1 mm to 3 mm accounts for 23.5% to 30.0%, 0.5 mm to 1.0 mm accounts for 8.2% to 17.2%, and less than 0.5 mm accounts for 43.0% to 56.0%;

[0066] (6) using a tamping machine to make briquettes from the obtained coking powder;

[0067] (7) Coking: the prepared coal cakes are loaded into a coke oven for coking at a coking temperature of 1315°C to 1335°C and a coking time of 30 hours;

[0068] (8) The mature coke is loaded into a dry quenching furnace for quenching to obtain finished coke.

[0069] The performance parameters of the coke prepared by the above-mentioned coke blending and coking method are shown in Table 5.

[0070] Table 1: Performance parameters of asphalt and dust-removed coke powder

[0071]

[0072] Table 2: Performance parameters of various types of coal in blended coal

[0073]

[0074] Table 3: Performance parameters of coke obtained from different coking schemes of the embodiment

[0075]

[0076] Table 4: Performance parameters of coke obtained from different coking schemes in Comparative Example 1

[0077]

[0078] Table 5: Performance parameters of coke obtained from different coking schemes in Comparative Example 2

[0079]

[0080] As shown in Table 3, the asphalt is crushed and mixed with dust-removed coke powder, the mixed powder is heated and melted, and the crushed material is obtained after coking. The crushed material is mixed with blended coal for coking. The cokes produced in Schemes 1-6 have a post-reaction strength CSR greater than 65.5% and a crushing strength M 40 All are greater than 85%, the reaction index CRI is less than 25%, and the wear resistance M 10 All of them are less than 6%, among which the amount of dust-removed coke powder added in Scheme 6 is as high as 10%. It is further proved that by adding asphalt to prepare a fusion material of asphalt powder and dust-removed coke powder, and mixing it with blending coal for coking, the amount of dust-removed coke powder can be increased to 10%, and high-quality coke can be prepared.

[0081] As shown in Table 4, without adding asphalt powder, the dust-removed coke powder is added to the blended coal for coking. When the dust-removed coke powder addition amount is 5%, the post-reaction strength CSR and crushing strength M 40 Compared with the scheme 1 without adding dust removal coke powder, the reaction index CRI and wear resistance M 10 Compared with Scheme 1 without adding dust-removing coke powder, the increase is significant, which further verifies that when the amount of dust-removing coke powder added is greater than 3%, it significantly affects the quality of coking coal.

[0082] As shown in Table 5, the asphalt powder and the dust-removed coke powder are mixed evenly to prepare a mixed powder, and the mixed powder is added to the blended coal for coking. The coke prepared in Scheme 1 has a lower strength CSR and crushing strength M than the coke prepared in Scheme 1 of Comparative Example 1 without adding dust-removed coke powder. 40 The reaction index CRI and wear resistance M 10 The reaction strength CSR is still greater than 65.5%, and the crushing strength M 40 Greater than 85%, reaction index CRI less than 28%, wear resistance M 10 Less than 6.8%; the amount of dust removal coke powder added is 5%. The post-reaction strength CSR of Scheme 2-5 is significantly reduced and the wear resistance M 10 The CRI of scheme 4-5 increased significantly, and the crushing strength M 40 It is significantly reduced, indicating that when the asphalt powder and the dust-removed coke powder do not go through the melting, cooling and crushing steps, when the amount of dust-removed coke powder added is too large, such as when the addition amount reaches 8% or more, the quality of coke will be significantly reduced.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for coking high-quality coke by blending coal, comprising the following steps: (1) crushing the asphalt and passing it through a sieve with a pore size of 3 mm to obtain asphalt powder; (2) Asphalt powder and dust-removed coke powder are mixed evenly in a mass ratio of 1:1 to 1:2 to obtain a mixed powder; the dust-removed coke powder has an ash yield of 10% to 12%, a volatile matter of 0.5% to 0.7%, and a total sulfur content of 0.8% to 0.9%, and has no adhesiveness; (3) heating the obtained mixed powder to 160°C to 200°C to melt it, and then cooling it to obtain a fusion material; (4) coarsely crushing the obtained fused material to obtain crushed material; (5) Each type of coal is blended according to the following mass proportions, totaling 100 parts, to obtain blended coal: 17 to 23 parts of 1 / 2 medium-coking coal, 15 to 20 parts of gas coal, 30 to 40 parts of coking coal A, 4 to 6 parts of fat coal, 6 to 10 parts of coking coal B, 3 to 5 parts of coking coal C, and 8 to 12 parts of lean coal; (6) The crushed material is pre-mixed with the blended coal to prepare a coking mixture, and the mass ratio of the crushed material to the blended coal is 1:9~1:4; (7) crushing the obtained coking mixture to obtain coking powder; (8) using a tamping machine to make briquettes from the obtained coking powder; (9) Coking: the prepared coal cakes are put into a coke oven for coking at a coking temperature of 1315°C to 1335°C and a coking time of 26.5h to 30h; (10) The mature coke is loaded into a dry quenching furnace for quenching to obtain finished coke; the coke strength after reaction CSR is greater than 65.5%, and the crushing strength M 40 All are greater than 85%, the reaction index CRI is less than 25%, and the wear resistance M 10 Both are less than 6%.

2. The method for coking high-quality coke by blending coal according to claim 1, characterized in that: In the step (2), the ash yield of the asphalt powder is 1% to 3%, the volatile matter is 58% to 68%, the total sulfur content is 0.4% to 0.7%, and the adhesion G value is 86 to 95.

3. The method for coking high-quality coke by blending coal according to claim 1, characterized in that: In the step (5), the ash yield of 1 / 2 of the sticky coal is 5% to 7%, the volatile matter is 28% to 35%, the total sulfur content is 0.4% to 0.6%, and the cohesiveness G value is ≥10.00; The ash yield of gas coal is 9%~11%, the volatile matter is 35%~38%, the total sulfur content is 0.4%~0.6%, the thickness of the colloid layer Y value is 14mm~23mm, and the G value is 65~70; The ash yield of coking coal A is 9%~11%, the volatile matter is 20%~28%, the total sulfur content is 0.5%~0.7%, the Y value is 15mm~25mm, and the G value is 65~80; The ash yield of fat coal is 10%~13%, the volatile matter is 28%~35%, the total sulfur content is 0.8%~1.0%, the Y value is ≥21mm, and the G value is ≥85; The ash yield of coking coal B is 9%~11%, the volatile matter is 20%~28%, the total sulfur content is 1.6%~2.1%, the Y value is 15mm~25mm, and the G value is ≥65; The ash yield of coking coal C is ≤9%, the volatile matter is 20%~30%, the total sulfur content is 2.4%~2.7%, the Y value is 15mm~25mm, and the G value is ≥65; The ash yield of lean coal is 9%~11%, the volatile matter is 15%~20%, the total sulfur content is 0.5%~0.7%, there is no clear requirement for the Y value, and the G value is 50~65.

4. The method for coking high-quality coke by blending coal according to claim 1, characterized in that: In the step (7), the mass of the coking powder has a particle size of less than 3.0 mm accounting for 86.0% to 90.0%, of which 1 mm to 3 mm accounts for 23.5% to 30.0%, 0.5 mm to 1.0 mm accounts for 8.2% to 17.2%, and less than 0.5 mm accounts for 43.0% to 56.0%.

5. A high-quality coke prepared by the high-quality coke coal blending and coking method according to any one of claims 1 to 4.

6. The high-quality coke according to claim 5, characterized in that: The coke reaction strength CSR is greater than 65.5%, and the crushing strength M 40 All are greater than 85%, the reaction index CRI is less than 25%, and the wear resistance M 10 Both are less than 6%.

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