Abstract
The effects of NaCl on the capture of SO 2 by CaCO 3 during coal combustion were studied using a thermogravimetric analyzer. All experiments were carried out in a flowing air atmosphere at a heating rate of 10, 20 or 30 °C/min. The experimental results showed that more SO 2 reduction was achieved as long as NaCl was added together with CaCO 3 to coal. It indicated that NaCl improved the behavior of CaCO 3 capturing SO 2. NaCl alone reduced SO 2 emission within the range from 300 to 700 °C in the experiments, while the capture of SO 2 by NaCl alone would be reemitted when temperature was raised over 700 °C. Adding sorbents such as CaCO 3 together with NaCl was necessary for a reliable SO 2 reduction.
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