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Arsenic emission from coal combustion is of great concern due to its high toxicity and ecological environment hazards. Toxicity of arsenic is related to its speciation. Effects of CaO and SO 2  on arsenic emission during SH and HLH coal combustion at high temperature were obtained through thermodynamic calculation. It indicates that the volatilisation ratio of arsenic in the form of As 4 O 6  (g) increases as the combustion temperature increasing. Coal type and content of CaO significantly affect the transition temperature of arsenic volatilisation. During SH combustion, with the addition of 10 wt % CaO, the inhibition rate of arsenic volatilisation is gradually increased to its maximum value of 30.46% at 900°C. The transition temperature of arsenic volatilisation is 1100°C and the inhibition rate is 42.74% with 20 wt % CaO added. As for HLH, either 10 wt % or 20 wt % CaO is added, the transition temperature are both 1200°C, with the inhibition rate of 36.46% and 48.37%, respectively. Moreover, competition is existed between SO 2  and arsenic during coal combustion. When the temperature is above 1100°C, for the preferential reaction between CaSO 4  and As 4 O 6 , the competition of SO 2  on arsenic volatilisation is weakened.

Effect of CaO and SO 2 on the distribution of arsenic species during coal combustion at high temperature