Abstract
A framework integrated the advanced exergy analysis with the theory of life cycle assessment is constructed to evaluate and optimize the environmental performance of energy conversion systems. The SJ-type oil shale retorting (SJ-OSR) process as one of the energy conversion systems with severe environmental pollution is employed to demonstrate the feasibility of the proposed approach. The results show that the avoidable exergy destruction of the retorting unit and recycle gas combustion unit to their total exergy destruction are 56.49% and 65.12%, respectively. The environmental impact for the total exergy destruction (BD,tot) of the SJ-OSR process is 1219.05 mPts/s. The environmental impact for total endogenous exergy destruction is 984.63 mPts/s, which accounts for 80.77% of the BD,tot. As for the drying, retorting and recycle gas combustion units, their environmental impacts related to avoidable exergy destruction rates are larger than the unavoidable parts. Most of the environmental impact with respect to the avoidable exergy destruction rates is endogenous (350.22 mPts/s). Based on the proposed two improvement strategies, ultimately, the BD,tot of the improved process decreases obviously from 1219.05 mPts/s to 1037.87 mPts/s, and the proportion of BD,tot reduced is about 14.86% of that for the existing process.
Published Version
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