Two-Stage Combustion of High-PVC Solid Waste With HCL Recovery

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A waste-to-energy process based on high-PVC solid wastes is discussed. The basis is that at 200-400°C the PVC fraction decomposes into hydrogen chloride (HCl) and a cokeslike residue. This can then be combusted as any other chlorine-free solid waste-derived fuel. Products of the process, that is composed of two fluidised bed reactors and a heat recovery system are electricity, and recovered HCl. A thermal efficiency analysis using PROSIM software showed that efficiencies of ~36% (electric) can be reached, depending on pyrolysis temperature and the PVC content in the solid waste. HCl recovery can be above 90% at pyrolysis temperatures above 310°C, combined with low HCl emissions from the combustor that may be below legislative emission limits without gas cleaning.

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