STUDY ON CALORIFIC VALUE OF SEMI-COKE AND DESULFURIZATION EFFECT DURING PYROLYSIS OF BITUMINOUS COAL.

Taking bituminous coal with medium sulfur content as experimental coal sample, the effect of desulfurization, calorific value and volatile matter were studied. Pyrolysis of coal samples was conducted in a high temperature furnace with different pyrolysis time, different temperature and different mass. The effects of pyrolysis conditions on desulfurization efficiency, semicoke volatilization and calorific value were investigated. The results showed that: (l) Pyrolysis had the effect of desulfurization, which was affected by pyrolysis temperature, pyrolysis time and pyrolysis quality; (2) The desulfurization efficiency of coal pyrolysis reached 29.91 % in 16 min, the desulfurization efficiency was good, and the calorific value of semicoke was 22.99kJ/g; (3) In the temperature range of 450°C to 650°C, the desulfurization efficiency had little change, at this time, semicoke had the effect of sulfur fixation; (4) The maximum specific surface area of semicoke was 102.78m²/g at 650°C and the reduction of C-S and S-O functional groups in the FTIR spectrum of semicoke result in desulfurization during pyrolysis. [ABSTRACT FROM AUTHOR]