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A reactor with two reaction zones (pyrolysis and combustion) was used to study the formation of HCl from PVC and NaCl and the dechlorination capacity of Ca(OH)2. Several types of RDF (Refused-Derived Fuels) containing PVC or NaCl and with Ca(OH)2 or without Ca(OH)2 were first prepared in our laboratory. Then the formation of HCl from different chlorine resource and the dechlorination capacity of Ca(OH)2 under different operating conditions were studied. The amount of HCl produced from PVC and NaCl was found to be quite different under the same operating condition. High temperature did not favor the dechlorination capacity of Ca(OH)2. Thermogravimetric studies revealed that CaCl2 has a poor thermal stability at high temperature. This may be the reason the dechlorination capacity of Ca(OH)2 decreases with increasing temperature.
Wang et al. (2002) studied this question.