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Question: In coke oven production, how is the amount of raw coal gas generated per ton of coal calculated?
The composition of gas is related to the degree of metamorphism of carbonized coal. In the gas produced by the dry distillation of coal with a young metamorphic age, the contents of CO, CnHm, and CH4 are high, while the hydrogen content is low. As the metamorphic age increases, the contents of the first three decrease, while the hydrogen content increases. Therefore, the coal blending composition has a significant impact on the composition of gas. The gas yield Q (%) is related to the volatilinity of the coal blend, and can be calculated using the following formula: Q = a × √Vdaf. Here, a is a coefficient (a = 3 for gas coal, and a = 3.3 for coking coal); Vdaf represents the dry, ash-free basis volatilinity of the coal blend, in %. Since the moisture content of wet coal is unstable and not suitable as a benchmark, the yields mentioned above are all expressed as percentages based on the mass of dry coal.
Under normal conditions, the volatilization rate is 28%-31%, yielding 320-350 cubic meters of gas per ton of coal.
There’s no need to carry out calculations; and even if calculations are done, they are only rough estimates. For example, the formula given for the second floor is Q=a V1/2daf, and without a scientific calculator, it’s difficult to even take square roots. Furthermore, there are calculation formulas only for bituminous coal and coking coal, but the coal fed into the furnace is mixed coal – can calculations still be done in this way?
For top-loading coke ovens, the volume of gas produced per ton of dry coal is 320–330 cubic meters; I will use 325 cubic meters as a basis for calculating various values (such as the flow rate in the main gas pipes in the basement, which should not exceed around 200 cubic meters). For ramming coke ovens, the volume of gas produced per ton of dry coal is 330–350 cubic meters; I will use 340 cubic meters for these calculations. Many of the data match well.
The coking output can be measured individually using flow meters!
The flow rate of the raw coking gas at the outlet can be measured using a flow meter!