Performance analysis of a novel power generation design containing the drying and Co-gasification of sludge and biomass integrated with the waste heat recovery of a cement plant

Lanxin Fan, Heng Chen, Yue Gao, Huanlin Zhao, Lei Yao, Yu Li, Shuyuan Zhao and Peiyuan Pan

Energy, 2025, vol. 326, issue C

Abstract: The integration of drying and co-gasification for sewage sludge and biomass with waste heat recovery from cement plants presents an innovative approach to enhancing energy efficiency and sustainability. In this system, flue gas from cement kilns serves as a heat source for drying sludge and biomass, enabling multi-stage utilization of waste heat. The dried feedstock undergoes co-gasification to produce syngas, which powers a gas turbine for electricity generation. High-temperature exhaust gases from the turbine are further harnessed by the waste heat recovery system to boost overall power output. Thermodynamic and economic evaluations demonstrate that the proposed system achieves energy and exergy efficiencies of 44.03 % and 47.48 %, respectively, indicating effective energy utilization. With a net present value (NPV) of 69,197.79k$, a dynamic payback period (DPP) of 6.80 years, and a levelized cost of electricity (LCOE) of 32.90 $/MWh, the system exhibits strong economic viability. Sensitivity analyses of co-gasification performance and key economic parameters underscore its potential to address waste management challenges and advance sustainable cement production.

Keywords: Sewage sludge; Biomass; Co-gasification; Cement plant; Waste heat recovery; Thermodynamics and economic analysis (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:326:y:2025:i:c:s0360544225019735

DOI: 10.1016/j.energy.2025.136331

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