A method for regulating the properties of coking coal by recombining coal

Abstract

The present application relates to a kind of coking coal property recombination coal blending control method, comprising:1) preparation of blending coal LC;2) preparation of blending coal HC;3) ensure the property index of blending coal HC is better than blending coal LC;4) ensure the single-hole carbonization chamber loading capacity of blending coal HC>the single-hole carbonization chamber loading capacity of blending coal LC;The present application improves the existing coal blending mode from "coal blending first, then crushing" to "particle size-coal quality collaborative coal blending", by the comparison between the blending coal consisting of single coal of optimal particle size and conventional blending coal, the purpose of optimizing coking coal particle size distribution is achieved;Combined with raw coal particle size distribution and crusher process parameter adjustment, the different particle size distribution of coking coal, the property index of blending coal, the carbonization chamber loading capacity are collaboratively controlled, and then the accuracy and uniformity of coking coal blending are improved, the single-hole carbonization chamber loading capacity is improved, the coke oven production efficiency is improved, and the coking production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coking coal blending, and particularly relates to a coking coal property recombination blending control method. BACKGROUND

[0002] At present, coking coal generally comes from washed coal of coal mines. The washed coal refers to high-quality coal which is processed by a coal washing plant, and has reduced ash content, sulfur content and impurities, and is suitable for some special purposes (such as coking). The coking coal generally has uneven particle size, and needs to be crushed to ensure the uniformity of coal blending. In recent years, the particle size of single coal for coking is getting smaller and smaller. When the proportion of small particles in the coking coal is too large, the dust and particle pollutants increase during coking and coal loading, and the gas collecting pipe is blocked. If the coking coal is too fine, the bulk density of the loaded coal is reduced, and the coke yield is affected. If the coking coal is crushed as a whole, the active coal in the coking coal will be crushed too finely, which reduces the liquid product, and the gas product is easy to escape during the softening and melting process, thereby reducing the binding ability between coal particles. If the coking coal is too fine, the phenomenon of "thinning" of the coal may occur, and the particles of vitrinite component in the coking coal need to be crushed to avoid excessive crushing. If the coking coal is not crushed or the crushing degree is not enough, the particle size of the inert coal in the coking coal will be too large, and the generated coke is easy to form a crack center, thereby reducing the strength of the coke. Therefore, it is necessary to reduce the large particles in the inertinite component of the coking coal. Therefore, the conventional adjustment of the fineness (the proportion of particles with a particle size of less than 3 mm) of the coking coal is not suitable for the situation that the fineness of the coking coal is getting larger and larger. Although the quality of the coke can be improved by increasing the proportion of high-quality coking coal, this will increase the production cost of the coking coal blending.

[0003] Therefore, it is necessary to develop a coking coal blending method for coking coal with large fineness under the premise of using existing raw materials and without increasing production costs, so as to improve the quality of the coke.

[0004] A Chinese patent application with the application number 200910272633.7 discloses a method for determining the optimal particle size of finely crushed gas coal participating in coking coal blending (hereinafter referred to as scheme one), which includes the following steps: step (1) crushing the gas coal according to different particle size crushing levels; step (2) mixing each with a single coal according to the same proportion to obtain a mixed coal; step (3) placing each mixed coal into a crucible, heating at a temperature of 850±10℃ for 13-20 minutes, and weighing the coke block m; step (4) rotating each in a caking index drum for 250±50 revolutions, sieving, and weighing the coke block m1; step (5) rotating each in the caking index drum for 250±50 revolutions, sieving, and weighing the coke block m2; step (6) bringing each group of m, m1 and m2 into the formula X=(30*m1+70*m2) / m+10 for calculation; and step (7) the particle size corresponding to the maximum X value is the optimal particle size of the finely crushed gas coal. The method can ensure that the particle size of the coal charge is reasonable, and the quality of the produced coke is stable.

[0005] Chinese patent application No. 201710383616.5 discloses a "coking coal blending pulverization fineness control method" (hereinafter referred to as scheme two), comprising the following steps: 1) sampling and detecting the moisture and particle size of each single coal under each bin before coking coal blending pulverization; 2) adjusting the pre-speed of the air separation equipment according to the moisture and particle size of each single coal and the conveying capacity, and presetting the back-blowing air volume; 3) grouping and mixing each single coal into the air separation system, and sampling after starting air separation; 4) adjusting the conveying capacity, air separation equipment speed and back-blowing air volume of the air separation system according to the particle size of the sampling after air separation; 5) grouping and mixing the coal powder under the screen after air separation and the coal after pulverization to form coking charging coal, and sampling and detecting in the system leading to the coal tower, if the coal powder particle size exceeds the set standard, the data of the above three sampling points will be analyzed, and the adjustment will be made as above; 6) adjusting the pulverizer according to the sampling information after pulverization; and 7) grouping and mixing the coal powder under the screen after air separation and the coal after pulverization to form coking charging coal, and sampling and detecting in the system leading to the coal tower, if the coal powder particle size exceeds the set standard, the data of the above three sampling points will be analyzed, and the adjustment will be made as above.

[0006] Scheme one uses gas coal mixed with different coals, then takes more than 1mm coke blocks twice by drum, and calculates the best particle size of gas coal by formula. Although it can determine the best particle size of gas coal, it does not involve the caking index of gas coal in the process of technical index determination, but only determines the best particle size of fine pulverized gas coal by the particle size of coke after drumming after coking. Scheme two adjusts the pulverizer parameters according to the particle size of the air separated coal powder by air separation process sampling, and then achieves online control of the fineness of the blending coal. The above two schemes are different from the present application. SUMMARY

[0007] The present application provides a coking coal property recombination coal blending control method, which improves the existing coal blending method from "blending coal first and then pulverizing" to "particle size-coal quality collaborative coal blending", compares the blending coal composed of single coals with the best particle size with the conventional blending coal, and optimizes the particle size distribution of the coking coal; adjusts the particle size distribution of the coking coal, the property index of the blending coal and the charging capacity of the carbonization chamber in combination with the process parameters of the raw coal bin and the pulverizer, and then improves the accuracy and uniformity of the coking coal blending, increases the charging capacity of the single hole carbonization chamber, improves the efficiency of the coke oven and reduces the production cost of coking.

[0008] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0009] A coking coal property recombination coal blending control method, comprising the following steps:

[0010] 1) preparing a blending coal LC;

[0011] The coking coal is composed of gas coal, gas fat coal, coking coal, fat coal, lean coal and 1 / 3 coking coal according to a set coal blending ratio; each single coal constituting the coking coal is blended and crushed to obtain the blended coal LC; the fineness of the blended coal LC is controlled at 70% to 80%; the fineness refers to the mass proportion of the coal powder with a particle size of less than 3 mm in the blended coal;

[0012] 2) preparing the blended coal HC;

[0013] Each single coal constituting the coking coal is sieved, the mass of each single coal in each particle size interval is weighed, and the mass fraction of each particle size interval is calculated; the property indexes of each single coal in different particle size intervals after sieving are detected respectively to determine the target range of the broken particle size of each single coal; each single coal is broken respectively, and the particle size after breaking is ensured to be within the corresponding target range of the broken particle size; the broken single coals are mixed according to the same coal blending ratio as in step 1) to obtain the blended coal HC;

[0014] 3) ensuring that the property indexes of the blended coal HC are better than those of the blended coal LC;

[0015] The property indexes of the blended coal HC and the blended coal LC are detected; if the property indexes of the blended coal HC are better than those of the blended coal LC, it indicates that the particle size range of each single coal meets the target requirement; if the property indexes of the blended coal HC are worse than those of the blended coal LC, the target range of the broken particle size of each single coal is reduced by further subdividing the particle size interval, and the property index detection is performed again until the property indexes of the blended coal HC are better than those of the blended coal LC;

[0016] 4) ensuring that the single-hole carbonization chamber coal loading capacity of the blended coal HC is greater than that of the blended coal LC;

[0017] The blended coal HC is used to load the carbonization chamber to determine the single-hole carbonization chamber coal loading capacity; if the single-hole carbonization chamber coal loading capacity of the blended coal HC is greater than that of the blended coal LC, it indicates that the particle size range of each single coal meets the target requirement; if the single-hole carbonization chamber coal loading capacity of the blended coal HC is less than or equal to that of the blended coal LC, the target range of the broken particle size of each single coal is reduced by further subdividing the particle size interval until the single-hole carbonization chamber coal loading capacity of the blended coal HC is greater than that of the blended coal LC.

[0018] Further, the particle size distribution of the sieved single coal includes 6 particle size intervals of (0-0.5mm], (0.5-1mm], (1-2mm], (2-3mm], (3-5mm] and >5mm.

[0019] Further, the property indexes of the coking coal at least include one index of ash content, volatile matter content, sulfur content, G value, Y value and vitrinite content.

[0020] Further, the set coal blending ratio is: gas coal 0-20%, gas fat coal 0-20%, coking coal 30-60%, fat coal 20-40%, lean coal 0-30%, 1 / 3 coking coal 15%-35%, and lean coking coal 0-20% by weight ratio.

[0021] Further, in the step 2), each single coal is crushed by a hammer crusher; large particles after crushing are secondarily crushed by adjusting parameters of the hammer crusher or adding a bar screen; the parameters of the hammer crusher include the number of hammer heads, the distribution of hammer heads, the distance between the hammer heads and the counterattack plate, the weight of the hammer heads and the shape of the hammer heads.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1) The existing coal blending method is improved from "coal blending first and then crushing" to "particle size and coal quality coordinated coal blending", through comparison between the blended coal composed of single coals with optimal particle size and the conventional blended coal, the particle size distribution of coking coal is optimized, the properties of coking coal are improved, and the coke strength quality CSR is increased by more than 1 percentage point;

[0024] 2) According to the relationship among the particle size distribution of coking coal, the property indexes of coking coal, and the single-hole coal charging capacity of the coke oven, the particle size distribution of the raw coal is changed by adjusting the process parameters of the crusher, the different particle size distributions of coking coal, the property indexes of the blended coal, and the coal charging capacity of the carbonization chamber are coordinated controlled, thereby improving the accuracy and uniformity of coking coal blending, increasing the single-hole carbonization chamber coal charging capacity by more than 2000 kg, improving the production efficiency of the coke oven, and reducing the coking production cost;

[0025] 3) According to the different property index requirements of the blended coal, the particle size interval range of the crushed coking coal is adjusted, thereby improving the property index parameters of the coking blended coal;

[0026] 4) The present application comprehensively considers the correlation between the particle size of coking coal and the coking coal adhesion G value and Y value, and the correlation between the particle size of coking coal and the single-hole coal charging capacity of the carbonization chamber, and the coke quality is compared between the prior art of "coal blending first and then crushing" and the prior art of "crushing first and then coal blending", and a specific solution is given to realize online production adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a process flow chart of the coking coal property recombination coal blending regulation method according to the present application.

[0028] Figure 2 is a relationship diagram between the particle size distribution of single coal and the adhesion index G value in embodiment 1 of the present application.

[0029] Figure 3 is a relationship diagram between the number of hammer heads of the hammer crusher and the fineness of coking coal in embodiment 1 of the present application.

[0030] Figure 4 is a vitrinite content comparison chart of different particle size ranges of single coals in embodiment 2 of the present application. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application are further described below with reference to the accompanying drawings:

[0032] As shown in the figure, the coking coal property recombination blending method of the present application comprises the following steps: Figure 1

[0033] 1) preparing a blending coal LC;

[0034] The coking coal is composed of gas coal, gas-fat coal, coking coal, fat coal, lean coal and 1 / 3 coking coal after being mixed according to a set blending ratio; each single coal constituting the coking coal is blended and crushed to obtain the blending coal LC; the fineness of the blending coal LC is controlled at 70% to 80%; the fineness refers to the mass proportion of the coal powder with particle size <3mm in the blending coal;

[0035] 2) preparing a blending coal HC;

[0036] Each single coal constituting the coking coal is sieved, the mass of each single coal in each particle size interval is weighed, and the mass fraction of each particle size interval is calculated; the property indexes of each single coal in different particle size intervals after sieving are detected respectively to determine the target range of the broken particle size of each single coal; each single coal is broken, and the particle size after breaking is ensured to be within the corresponding target range of the broken particle size; each single coal after breaking is mixed according to the same blending ratio as in step 1) to obtain the blending coal HC;

[0037] 3) ensuring that the property indexes of the blending coal HC are better than those of the blending coal LC;

[0038] The property indexes of the blending coal HC and the blending coal LC are detected; if the property indexes of the blending coal HC are better than those of the blending coal LC, it indicates that the particle size range of each single coal meets the target requirement; if the property indexes of the blending coal HC are worse than those of the blending coal LC, the target range of the broken particle size of each single coal is reduced by further subdividing the particle size interval, and the property index detection is performed again until the property indexes of the blending coal HC are better than those of the blending coal LC;

[0039] 4) ensuring that the coal loading amount of the single hole carbonization chamber of the blending coal HC > the coal loading amount of the single hole carbonization chamber of the blending coal LC;

[0040] ​The single-hole carbonization chamber is filled with the coal HC to determine the filling amount of the single-hole carbonization chamber; if the filling amount of the single-hole carbonization chamber of the coal HC is greater than that of the single-hole carbonization chamber of the coal LC, it indicates that the particle size range of each single coal meets the target requirement; if the filling amount of the single-hole carbonization chamber of the coal HC is less than or equal to that of the single-hole carbonization chamber of the coal LC, the target range of the broken particle size of each single coal is narrowed by further subdividing the particle size interval until the filling amount of the single-hole carbonization chamber of the coal HC is greater than that of the single-hole carbonization chamber of the coal LC.

[0041] Further, the particle size distribution of the single coal after screening includes six particle size intervals of (0-0.5mm], (0.5-1mm], (1-2mm], (2-3mm], (3-5mm] and >5mm. The small parentheses represent greater than, and the middle brackets represent less than or equal to; for example, (0.5-1mm] means that 0.5mm < particle size ≤ 1mm.

[0042] Further, the property index of the coking coal at least includes one index of ash content, volatile matter, sulfur content, G value, Y value and vitrinite content.

[0043] Further, the set blending ratio is as follows in terms of weight ratio: gas coal 0-20%, gas fat coal 0-20%, coking coal 30-60%, fat coal 20-40%, lean coal 0-30%, 1 / 3 coking coal 15%-35%, and lean coking coal 0-20%.

[0044] Further, in the step 2), each single coal is broken by a hammer crusher; the large particles after screening are secondarily crushed by adjusting the parameters of the hammer crusher or adding a bar screen; the parameters of the hammer crusher include the number of hammer heads, the distribution of hammer heads, the distance between the hammer heads and the impact plate, the weight of the hammer heads and the shape of the hammer heads.

[0045] The following examples are implemented on the premise of the technical scheme of the present application, and detailed implementation modes and specific operation processes are given, but the protection scope of the present application is not limited to the following examples.

[0046]

Example 1

[0047] In this embodiment, the coking coal property recombination blending control method is as follows:

[0048] 1. The gas coal, gas fat coal, coking coal, fat coal, 1 / 3 coking coal, lean coking coal and lean coal for coking are screened respectively, the mass of each single coal corresponding to each particle size interval is weighed, and the mass proportion of each particle size interval is calculated, as shown in Table 1.

[0049] Table 1 Mass proportion of different particle size intervals of each single coal (%)

[0050] > 5 mm 3-5 mm 2-3 mm 1-2 mm 0.5-1 mm < 0.5 mm gas coal 31.7 39.8 2.6 6.0 14.2 5.7 fat coal 34.8 20.6 1.4 3.3 16 23.9 fat coal 18.3 23.7 1.9 2.1 22.9 31.1 coking coal 5.7 18.1 2.3 5.3 30 38.6 1 / 3 coking coal 23.8 23.9 1.6 4.1 17 29.6 lean coal 7.1 14.1 1.4 4.3 21.4 51.7 lean coking coal 20.5 2.2 5.5 15.6 35.7 20.5

[0051] 2. Respectively detect the G value of each single coal corresponding to different particle size ranges after screening, and determine the particle size range corresponding to the maximum G value.

[0052] As shown in Figure 2 , it is a graph showing the relationship between the particle size distribution of single coking coal and the G value of the coking index. The target value of the broken particle size of gas coal is 2-5 mm, the target value of the broken particle size of gas-fat coal is 3-5 mm, the target value of the broken particle size of fat coal is 2-5 mm, the target value of the broken particle size of coke coal is 1-3 mm, the target value of the broken particle size of 1 / 3 coke coal is less than 2 mm, and the target value of the broken particle size of lean coke coal is <1 mm. According to the particle size distribution of conventional coking coal and the property index characteristics of each particle size single coal, the process parameters of the pulverizer are adjusted, i.e. the number of hammer heads of the hammer crusher is increased, and the relationship between the number of hammer heads of the pulverizer and the fineness of the coking coal is obtained through a large number of experiments (as shown in Figure 3 ), so as to ensure that the maximum proportion interval of the particle size quality of each single coal after crushing is the same as the optimal interval of the G value.

[0053] 3. According to the blending method of conventional coking coal, the coking coal is blended in a proportion of gas coal: gas-fat coal: coke coal: fat coal: 1 / 3 coke coal: lean coke coal: lean coal = 5:5:30:35:15:5:5 (weight ratio), and then the blended coal is crushed to obtain blended coal LC, and the fineness of the blended coal LC is controlled at 73%.

[0054] 4. The crushed single coals are mixed according to the same blending ratio to obtain blended coal HC.

[0055] 5. The caking index G value of the blended coal HC is 88, and the caking index G value of the blended coal HC is compared with the caking index G value (86) of the blended coal LC, and it is confirmed that the caking index G value of the blended coal HC is better than the caking index G value of the blended coal LC.

[0056] 6. The blended coal HC is used to load coal in a single-hole carbonization chamber, and the dry coal loading capacity of a 6m coke oven is 28.52t, while the single-hole carbonization chamber loading capacity of the blended coal LC is 28.30t, and the single-hole carbonization chamber loading capacity of the blended coal HC is > the single-hole carbonization chamber loading capacity of the blended coal LC, which indicates that the particle size range of each single coal meets the target requirement, and the blended coal HC can be directly loaded into the oven for coking production.

[0057] The quality of the produced coke is compared, and the CSR of the coke is 66.2% when the "blending before crushing" is adopted; and the CSR of the coke is 67.8% when the "particle size-coal quality collaborative blending" of the present application is adopted.

[0058]

Example 2

[0059] In this embodiment, the coking coal property recombination blending regulation method is as follows:

[0060] 1. Screen the coking coal, fat coal, and 1 / 3 coking coal for coking, weigh the mass of each type of coal corresponding to each particle size range, and calculate the mass ratio of each particle size range, as shown in Table 2.

[0061] Table 2. Mass percentage of different particle size ranges for each type of coal (%)

[0062] Coal Type > 5 mm 3-5 mm 2-3 mm 1-2 mm 0.5-1 mm < 0.5 mm fat coal 18.1 16.4 1.5 3.5 20.4 40.1 coking coal 29.2 18.9 1.5 3.9 18.7 27.8 1 / 3 coking coal 23.8 23.9 1.6 4.1 17 29.6

[0063] 2. Detect the vitrinite content of individual coal types within different particle size ranges after sieving, such as... Figure 4 As shown. The particle size range for maximizing vitrinite content in coking coal, bituminous coal, and 1 / 3 coking coal was determined. The target particle size for bituminous coal was 1–2 mm, for coking coal 0.5–3 mm, and for 1 / 3 coking coal 1–3 mm. For the target particle size for each coal type, after crushing bituminous coal, a 2 mm aperture bar screen was added for sieving. The material remaining on the screen was returned to the crusher until no material remained on the 2 mm aperture bar screen. Similarly, after crushing coking coal and 1 / 3 coking coal, a 3 mm aperture bar screen was added for sieving. The material remaining on the screen was returned to the crusher until no material remained on the 3 mm aperture bar screen.

[0064] Based on the particle size distribution of conventional coking coal and the property characteristics of individual coals at each particle size, the process parameters of the crusher are adjusted, namely, the number of hammers in the hammer crusher is increased to ensure that the proportion of the crushed fat coal particles is in the range of 1 to 2 mm, the proportion of the crushed coking coal particles is in the range of 0.5 to 3 mm, and the proportion of the crushed 1 / 3 coking coal particles is in the range of 1 to 3 mm.

[0065] 3. Following the conventional coking coal blending method, coking coal: fat coal: 1 / 3 coking coal = 30:40:30 (by weight) is blended and crushed to obtain blended coal LC. The fineness of blended coal LC is controlled at 80%.

[0066] 4. Mix the crushed individual coals according to the same blending ratio to obtain blended coal HC.

[0067] 5. The caking index Y value of the blended coal HC was 16. When compared with the caking index Y value (16) of the blended coal LC, it was found that the two were equal. It is necessary to further narrow the target particle size range of each single coal.

[0068] The target particle size ranges for crushing each type of coal were readjusted so that the maximum proportion of particle size after crushing of coking coal was 1.5-2 mm, the maximum proportion of particle size after crushing of coking coal was 1-3 mm, and the maximum proportion of particle size after crushing of 1 / 3 coking coal was 2-3 mm. After re-mixing according to the coal blending ratio in step 4, the Y value of HC of the blended coal was found to be 18 > the Y value of LC of the blended coal.

[0069] 6. For single-hole carbonization chamber charging with blended coal HC, the dry coal charging amount for a 6m coke oven single-hole carbonization chamber is 28.5t. For single-hole carbonization chamber charging with blended coal LC, the charging amount is also 28.5t. The single-hole carbonization chamber charging amount of blended coal HC equals the single-hole carbonization chamber charging amount of blended coal LC. The particle size of each individual coal in blended coal HC needs to be readjusted; the target particle size range for each individual coal needs to be further narrowed. Replacing the original 2mm aperture bar screen with a 1.8mm aperture bar screen resulted in a maximum proportion of 1.5-1.8mm particle size in the crushed coking coal; replacing the original 3mm aperture bar screen with a 2mm aperture bar screen resulted in a maximum proportion of 1-2mm particle size in the crushed coking coal; and replacing the original 3mm aperture bar screen with a 2.5mm aperture bar screen resulted in the highest proportion of 2-2.5mm particle size in the crushed 1 / 3 coking coal. The blended coal (HC) obtained after re-crushing and blending was then used for single-hole carbonization chamber charging in a 6m coke oven. The dry coal charging capacity in a single-hole carbonization chamber reached 28.8t, indicating that the particle size range of each individual coal type met the target requirements. The blended coal (HC) could be directly charged into the oven for coking production. The quality of the produced coke also improved from a CSR of 66.7% under the "blending first, then pulverizing" method to a CSR of 68.5% under the improved "particle size-coal quality co-blending" method.

[0070]

Example 3

[0071] In this embodiment, the method for adjusting the properties of coking coal through recombining and blending is as follows:

[0072] 1. Screen the coking coal, fat coal, and 1 / 3 coking coal for coking, weigh the mass of each type of coal corresponding to each particle size range, and calculate the mass ratio of each particle size range, as shown in Table 3.

[0073] Table 3. Mass percentage of different particle size ranges for each type of coal (%)

[0074] Coal Type > 5 mm 3-5 mm 2-3 mm 1-2 mm 0.5-1 mm < 0.5 mm fat coal 18.1 16.4 1.5 3.5 20.4 40.1 coking coal 29.2 18.9 1.5 3.9 18.7 27.8 1 / 3 coking coal 23.8 23.9 1.6 4.1 17 29.6

[0075] 2. Detect the vitrinite content of individual coal types within different particle size ranges after sieving, such as... Figure 4 As shown. The particle size range for maximizing vitrinite content in coking coal, bituminous coal, and 1 / 3 coking coal was determined. The target particle size for bituminous coal was 1–2 mm, for coking coal 0.5–3 mm, and for 1 / 3 coking coal 1–3 mm. For the target particle size for each coal type, after crushing bituminous coal, a 2 mm aperture bar screen was added for sieving. The material remaining on the screen was returned to the crusher until no material remained on the 2 mm aperture bar screen. Similarly, after crushing coking coal and 1 / 3 coking coal, a 3 mm aperture bar screen was added for sieving. The material remaining on the screen was returned to the crusher until no material remained on the 3 mm aperture bar screen.

[0076] According to the particle size distribution of conventional coking coal and the property index characteristics of each particle size single coal, the process parameters of the pulverizer are adjusted, i.e. the number of hammer heads of the hammer crusher is increased, so that the particle size of fat coal after being crushed is mostly within the range of 1-2 mm, the particle size of coking coal after being crushed is mostly within the range of 0.5-3 mm, and the particle size of 1 / 3 coking coal after being crushed is mostly within the range of 1-3 mm.

[0077] 3. According to the blending mode of conventional coking coal, the coking coal: fat coal: 1 / 3 coking coal = 30:40:30 (weight ratio) is blended and crushed to obtain the blended coal LC, and the fineness of the blended coal LC is controlled at 80%.

[0078] 4. The crushed single coals are mixed according to the same blending ratio to obtain the blended coal HC.

[0079] 5. The bonding index Y value of the blended coal HC is 18, and the S content is 0.78%, which are compared with the bonding index Y value (16) and the S content (0.82%) of the blended coal LC, and it is found that Y HC > Y LC , S HC <S LC , the property index of the blended coal HC is better than that of the blended coal LC, and the target particle size range of each single coal needs to be further reduced.

[0080] 6. The blended coal HC is used for single-hole carbonization chamber coal charging, and the dry coal charging capacity of the single-hole carbonization chamber of the 6m coke oven is 28.8t, the blended coal LC is used for single-hole carbonization chamber coal charging, and the coal charging capacity is 28.4t, the single-hole carbonization chamber coal charging capacity of the blended coal HC > the single-hole carbonization chamber coal charging capacity of the blended coal LC. It is shown that the particle size range of each single coal meets the target requirement, and the blended coal HC can be directly charged into the furnace for coking production, and the quality of the produced coke is also changed from CSR 66.9% when the "blending before crushing" is used to CSR 68.7% when the improved "particle size-coal quality collaborative blending" is used.

[0081] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for regulating the properties of coking coal by blending, characterized in that, The method comprises the following steps: 1) preparing a blending coal LC; The coking coal is composed of gas coal, gas-fat coal, coke coal, fat coal, lean coal and 1 / 3 coke coal after being mixed according to a set blending ratio; each single coal constituting the coking coal is blended and crushed to obtain the blending coal LC; the fineness of the blending coal LC is controlled to be 70% to 80%; the fineness refers to the mass proportion of the coal powder with a particle size less than 3 mm in the blending coal; 2) preparing a blending coal HC; Each single coal constituting the coking coal is sieved, the mass of each single coal in each particle size interval is weighed, and the mass fraction of each particle size interval is calculated; the property indexes of each single coal in different particle size intervals after sieving are detected respectively to determine the target range of the broken particle size of each single coal; each single coal is crushed respectively, and the particle size after crushing is ensured to be within the corresponding target range of the broken particle size; the crushed single coals are mixed according to the same blending ratio as in step 1) to obtain the blending coal HC; 3) ensuring that the property indexes of the blending coal HC are better than those of the blending coal LC; The property indexes of the blending coal HC and the blending coal LC are detected; if the property indexes of the blending coal HC are better than those of the blending coal LC, it indicates that the particle size range of each single coal meets the target requirement; if the property indexes of the blending coal HC are worse than those of the blending coal LC, the target range of the broken particle size of each single coal is reduced by further subdividing the particle size interval, and the property indexes are detected again until the property indexes of the blending coal HC are better than those of the blending coal LC; 4) ensuring that the single-hole carbonization chamber loading capacity of the blending coal HC is greater than that of the blending coal LC; The single-hole carbonization chamber loading capacity of the blending coal HC is determined by loading the carbonization chamber with the blending coal HC; if the single-hole carbonization chamber loading capacity of the blending coal HC is greater than that of the blending coal LC, it indicates that the particle size range of each single coal meets the target requirement; if the single-hole carbonization chamber loading capacity of the blending coal HC is less than or equal to that of the blending coal LC, the target range of the broken particle size of each single coal is reduced by further subdividing the particle size interval until the single-hole carbonization chamber loading capacity of the blending coal HC is greater than that of the blending coal LC.

2. The method according to claim 1, wherein the coking coal property recombination blending control method is characterized by, The particle size distribution of the single coal after sieving comprises six particle size intervals, i.e., (0-0.5 mm], (0.5-1 mm], (1-2 mm], (2-3 mm], (3-5 mm] and >5 mm.

3. The method according to claim 1, wherein the coking coal property recombination blending control method is characterized by, The property indexes of the coking coal at least include one of ash content, volatile matter content, sulfur content, G value, Y value and vitrinite content.

4. The method for regulating the blending of coal according to claim 1, wherein, The set blending ratio is as follows: gas coal 0-20%, gas-fat coal 0-20%, coke coal 30-60%, fat coal 20-40%, lean coal 0-30%, 1 / 3 coke coal 15%-35%, and lean coke coal 0-20% by weight.

5. The method for regulating the blending of coal according to claim 1, wherein, In step 2), a hammer crusher is used to crush each single coal; the large particles after sieving are secondarily crushed by adjusting the parameters of the hammer crusher or adding a bar screen; the parameters of the hammer crusher include the number of hammer heads, the distribution of hammer heads, the distance between the hammer heads and the counterattack plate, the weight of the hammer heads and the shape of the hammer heads.

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