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This post was last edited by wangshaobo on 2025-9-11 19:33. Common formulas for calculating the yield of coking products (recommended for saving). I. Coke yield: ●Total coke yield: The total coke yield refers to the percentage of coke produced from the dry distillation of coal fed into the furnace, relative to the amount of coal used. The calculation formula is: Total focal ratio (%) = Total coke production (on a dry basis) (tons) × 100% / Total coal fed to the furnace (on a dry basis) (tons). ●Metallurgical coking ratio: The metallurgical coking ratio refers to the percentage of metallurgical coke production in relation to the total amount of coke produced after screening. The calculation formula is: Metallurgical coke ratio (%) = Amount of metallurgical coke (on a dry basis) (tons) × 100% / Total coke production (on a dry basis) (tons). II. Empirical formula for tar yield: The tar yield depends on the volatile matter content on a dry, ash-free basis (Vdaf%) of the coal fed into the furnace, the degree of coal transformation, and the coking conditions. When the Vdaf% of the coal fed into the furnace is between 20% and 30%, the tar yield (Kx%) can be calculated using the following formula: Kx = –18.36 + 1.53Vdaf – 0.026Vdaf². III. Empirical formula for crude benzene yield: The yield of crude benzene increases as the carbon-to-hydrogen ratio (C/H) in the coal increases; moreover, the higher the volatile matter content in the coal, the lower the toluene content in the resulting crude benzene, and vice versa. The yield of crude benzene (KY%) can be calculated using the following formula, within the range of ash-free volatile matter in the coal fed into the furnace as mentioned above: KY = –1.6 + 0.144Vdar – 0.0016(Vdar)². Fourthly, there is an empirical formula for calculating the yield of ammonia: Ammonia originates from the nitrogen present in the coal used; its yield depends on the nitrogen content in that coal. Generally, coal contains about 2% nitrogen, and it is approximately 12–18% of this nitrogen that reacts with hydrogen at the high temperatures involved in coking to form ammonia. The yield of ammonia is usually around 0.25–0.35% of the dry weight of the coal. The empirical formula for the dry-base yield of ammonia (Kd) is as follows: Kd = 17/14 × bNd, % where b is the coefficient converting the total nitrogen content in coal to ammonia, typically ranging from 0.12 to 0.18 ； Nd—Dry basis nitrogen content in coal fed into the furnace, % ； 17, 14: The molecular weights of ammonia and nitrogen. V. Empirical formula for calculating gas production: The formula for calculating the output of coke oven gas (or production rate) y, in standard cubic meters, in relation to the volatiles content (Vd%) of the coal fed into the furnace is: y = 60.0 + 10.0Vd. For example, if the dry-base volatiles content Vd of the coal fed into the furnace is 28.5%, then y = 345 Nm3 per ton of dry coal.