A continuous monitoring technique for measuring all gases generated from coal during coking reaction was developed. This system has two gas detectors, which are a Fourier transform-infrared spectrometer for hydrocarbon, carbon monoxide and carbon dioxide and a semiconductor sensor (SnO2) for hydrogen. Using this system, the gas generation behavior on the condition of two levels, a laboratory scale (about 50 mg sample) and a coke test oven scale (about 120kg), were investigated. As a result, the tendency of both gas generation behaviors was in agreement and the gas generation behavior by difference of a coal combination was found. It was shown that the gas generated from plural coals was based on the additive property of gas from each combination coal.
