Calculation of net gas yield
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Typical books on coking processes state that the yield of clean gas is given by: Net gas yield = a × (V^0.5), where V represents the combustible volatile matter in the coal, and a is a coefficient; for bituminous coal, a = 3.0； For coking coal (a=3.3), which is used as coal fed into the furnace for coking, it cannot be just bituminous coal or subbituminous coal, or a mixture of the two. So I wonder, for coal fed into the furnace that is a mixture of various types of coal such as gas coal, fat coal, coking coal, and lean coal, how is the net gas yield calculated? If the a values for various individual coals are known, can the net gas yield be calculated using additivity?
The formulas are based on experience and are the result of statistical analysis; to date, no theoretical calculation methods have been discovered, and they are essentially empirical formulas derived from statistics! Coking still relies on experience and needs to be improved comprehensively from a theoretical perspective!
There is a saying that approximately 300–400 m3 of coking gas is produced per ton of coal
This statement is too general; for example, in rammed and top-loaded coke ovens, the volatility of the coal fed into the oven varies, so it would be reasonable to have different values in such cases.