[Prized Discussion] The meaning of coke particle size
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I have the following data available: Analysis results of coke samples – Coal: moisture, ash content, volatile matter, fixed carbon, sulfur content; maximum expansion temperature, degree of contraction, degree of expansion, total expansion rate; Kistler flow index, flow temperature, caking property, gel layer thickness. Values: Mad% Ad% Vd% FCd% St.d% ℃ a b TD LgMF Tmax℃ Tp-Tk℃ GR.I Ymm 0.28 9.17 17.65 73.18 0.75 490 17 30 47 1.83 484 450-517 84 13 0.29 9.04 18.03 72.93 0.35 486 10 38 48 1.89 483 444-509 82 13. For coke: particle size, mechanical strength, coking rate, thermal strength, cold strength; ash content, volatile matter, fixed carbon, sulfur content; reflectance of vitrinite group. Values: MS(mm) DI% Vd% CRI% CSR% Ad% Vd% FCd% St.d% Rr 70.9 85.5 84.2 30.7 51.8 11.36 1.00 87.64 0.66 1.47 56% 1.86 44% 72.0 85.8 85.0 35.0 47.9 11.15 0.79 88.06 0.34 1.47 64% 1.86 36%. The coke in the second category was produced from the coal in the first category. How is the particle size (MS) of coke determined? What is the quality of coke produced from this type of coal? This post was last edited by ryn on 2009-3-20 09:29]
The particle size MS of coke refers to its average particle size; the calculation formula involves taking the average value of each size range and multiplying it by the sum of the corresponding screening proportions. The lower limit is 0, while the upper limit is estimated based on the largest size of the coke particles. The values mentioned above are based on data obtained from coking using a single type of coking coal in a test furnace. The quality of the coke is generally good, but in practice, no one would use only one type of coking coal for coking
MS refers to the average particle size of coke, calculated using the weighted average method
Both types of coal provided by the poster are coking coals; generally, only one type of coal is not used in the coking process, as coking coals are too expensive and their use would not be cost-effective. Regarding the granularity provided by the original poster, it refers to the average particle size of coke; the vitrinite reflectance is generally used in coal analysis to determine whether the coal is a mixture of different types. This post was last edited by ryn on 2009-3-20 11:43]
According to our factory’s understanding, it should be the proportions of particles smaller than 10mm, 10–25mm, 25–40mm, 40–60mm, and those larger than 60mm; by taking the weighted average of these proportions, the average particle size can be determined
【Prize-based discussion】The meaning of coke particle size. Hello “Mahaai”, what is the prize?
The prize is additional points in wealth or charm, awarded based on the answers you provide. . .
I’ve only just figured out the issue regarding particle size as well. I went and asked someone who works in iron production, and he said that a particle size classification range for coke is determined based on the conditions of each blast furnace, and then it’s calculated using a weighted method. The approach is similar to what was mentioned on floor 5, except that nowadays the maximum particle size classification value for many blast furnaces is 80.
In fact, for ironmakers, what is more significant is the coefficient of uniformity of coke particle size, k = 40–80 mm%/ (>80 mm% + 40–25 mm%). Only when the coke particles are uniformly sized can the distribution of materials inside the blast furnace be even, thereby enhancing the efficiency of the blast furnace.