Search

[Display omitted] • Four integrated processes of poultry litter valorization are proposed. • Thermodynamic and techno-economic assessments are carried out. • The highest energy/exergy efficiency is accompanied by the highest H 2 yield. • The most exergy loss link occurs at gasification unit and Rankine cycle. • CO 2 separators in integrated processes show limited effect on energy-saving and cost-reduction. The utilization of poultry litter for converting poultry litter into energy or value-added products has great potential for energy saving and environmental protection. In this study, four integrated processes for treating poultry litter and obtaining high-value-added products have been studied: supercritical water gasification for hydrogen and electricity (SCWG-HE), supercritical water gasification for electricity (SCWG-E), steam gasification for electricity (SG-E) and steam gasification for hydrogen (SG-H). Thermodynamic and tech-economic assessments have been adopted to analyze the treatment alternatives comprehensively. The following findings have been obtained: (1) The energy/exergy efficiency of process has a positive correlation with the heat value of syngas; (2) The highest energy/exergy efficiency (57 % / 72 %) is accompanied by the highest H 2 yield (50.87 mol∙kg−1) under the operation conditions; (3) For each integrated process, the most exergy loss link occurs at the gasification unit and Rankine cycle; (4) CO 2 separators in integrated processes contribute little to energy-saving, accompanied with high investment (more than 27.5 % in SCWG-E, even until 74.2 % in SG-E). In conclusion, the findings of the study revealed the potential of multi-energy utilization for poultry litter in a farm and suggested that SG-H might be a better alternative with the highest efficiency and lowest equipment cost. [ABSTRACT FROM AUTHOR]