Sustainable hydrogen production from waste plastics via chemical looping technology: 4E (economic, environmental, energy, and exergy) analysis

초록

This study compared H2 production from waste plastics using a conventional water gas shift-based process (PsynWGS) with a chemical looping-based process (P-synCLH), through a comprehensive 4E (economic, environmental, energy, and exergy) analysis. Local and global sensitivity analyses were conducted, followed by multi-objective optimization using levelized cost of hydrogen (LCOH), greenhouse gas (GHG) emissions, and exergy destruction as objective functions. When each indicator was optimized, P-synCLH showed a 1.5% higher LCOH and 10.1% higher exergy destruction than P-synWGS, while achieving a 94.6% reduction in GHG emissions. Under carbon pricing of & euro;35/tCO2, P-synCLH showed a 6.2% lower LCOH than P-synWGS, a trend maintained across all process scales. Furthermore, the analysis was extended to four different waste plastic types (HDPE, LDPE, PP, and PET). For all plastic types considered, P-synCLH resulted in lower LCOH and GHG emissions, highlighting chemical looping as a promising pathway for H2 production from waste plastics.

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