Effect of Ca(OH)(2) on the Release Characteristics of HCl during Sludge Combustion

[Image: see text] With the addition of Ca(OH)(2), the effects of combustion temperature, moisture, sludge particle size, and chlorine-containing additives on the removal of HCl during sludge combustion were studied. The experimental results showed that combustion temperature and moisture content promoted the formation of HCl and Ca(OH)(2) played a key role in the formation of HCl during sludge combustion. Under the best conditions of a sludge particle size of 380–250 μm, moisture content of 5%, temperature of 850 °C, and Ca(OH)(2)/sludge weight ratio of 3/10, the HCl capture efficiency was 79.81%. In addition, the effect of PVC on the production of HCl was greater than that of NaCl, probably because the lattice energy of NaCl was much higher, indicating that inorganic chlorine was not the main source of HCl. Ca(OH)(2) can effectively inhibit the formation of HCl, which had practical guiding significance for the formation of HCl during the sludge combustion, especially the sludge containing chlorine.