Coke particle size for 6 top-mounted coke ovens

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Our plant’s coke ovens are of the JN60-6 type, with 4*55 tuyeres. The current coal blending ratio is approximately 38-40% hard coking coal, 16-20% fat coal, 28-30% semi-hard coking coal, and 12-14% lean coal. The particle size distribution of the coke produced after screening is as follows: 3.77% with a size of over 80 mesh, 26.28% between 60-80 mesh, 42.88% between 40-60 mesh, 18.16% between 25-40 mesh, and 8.99% with a size of less than 25 mesh. However, the blast furnace has consistently indicated that the coke particle size is too small, with a high ratio of coke to iron per ton (around 45 kg), and there is a need to improve the particle size. Could you all, experts, please provide information on your plant’s coke particle size distribution and the ratio of coke to iron per ton? (The sieve mesh sizes for the metallurgical coke used in blast furnaces and the coke powder are 22 mm and 12 mm respectively.) Also, please help us check whether our mixing ratio is reasonable. Additionally, the carbon content of our plant’s coke is between 86-87%, M10 is between 6.0-6.8%, CSR is between 65-69%, and CRI is between 20-25%. The central temperature of the coke cake ranges from 1100 to 1130, while the coking time is adjusted between 20 and 25 hours. The coal fineness is kept between 68 and 72, and the heating mode for the coke oven is 3 coks per 1 heater. The level in the blast furnace trough remains between 2 and 4 meters, with the blast furnace volumes being 2200 and 2600 m3.