As a novel energy recovery process from waste polyvinyl chloride(PVC), we have proposed a process consisting of asteam pyrolyzer for PVC, where steam decomposition of calcium chloride is also performed, a neutralizer forhydrogen chloride neutralized with alkali contained in waste glass and a char combustor. In this work, mass and heatbalance studies to see how much energy can be recovered from waste PVC were carried out for PVC based wallpaperand pipe material. Experiments were performed to obtain sufficient conditions for decomposing calcium chloride inthe char. In the pyrolyzer lower temperature pyrolysis was found favorable to prevent calcium chloride formation.However, thermodynamic equilibrium calculation showed that higher temperature was encouraging steamdecomposition of calcium chloride, which is crucial to remove all chlorine from residual char so that it can be burnedwithout producing much toxic byproducts. Based on these experiments and calculations the appropriate design for theprocess was made as a two-stage pyrolyzer consisting of low temperature pyrolysis at 573K and high temperaturechar treatment at 1073K followed by a neutralizer and a char combustor.
展开▼
