Abstract
Raw coal is used by many suburban and rural households for cooking and heating and results in severe air pollution, especially problematic SO2 emissions. A source treatment strategy was proposed to reduce SO2 emissions, which used the co-pyrolysis of raw coal with a CaCO3 additive to produce clean coke. The effect of Ca/S molar ratio on the SO2 capture efficiency of clean coke was investigated, and the SO2 retention efficiency was optimized at a Ca/S molar ratio of 1.5. The sulfur retention mechanism of clean coke was attributed to: (1) CaCO3 decomposition to CaO and partial reaction of CaO with H2S to generate CaS during pyrolysis. (2) Transformation of the remaining sulfur in the clean coke to SO2 during combustion, capture by unreacted CaO to form CaSO4, and direct oxidation of CaS to CaSO4. The feasibility of SO2 emission reduction by clean coke in a practical household stove was verified.
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