The main objective of this paper is to establish a mathematical framework to
analyze the complex thermal economic performance of the calcination process.
To find the factors affecting exergy efficiency loss, different exergy
destruction is investigated in detail. Furthermore, the exergy flow cost
model for exergy cost saving has also been developed. The results show that
the vertical shaft furnace is a self-sufficiency equipment without
additional fuel required, but the overall exergy destruction accounts for
54.11% of the total exergy input. In addition, the energy efficiency of the
waste heat recovery boiler and thermal deaerator are 83.52% and 96.40%,
whereas the exergy efficiency of the two equipment are 65.98% and 94.27%.
Furthermore, the import exergy flow cost of vertical shaft furnace, waste
heat recovery boiler and thermal deaerator are 366.5197 RMB/MJ, 0.1426
RMB/MJ and 0.0020RMB/MJ, respectively. Based on the result, several
suggestions were proposed to improve the exergoeconomic performance.
Assessing the performance of suggested improvements, the total exergy
destruction of vertical shaft furnace is reduced to 134.34 GJ/h and the
exergy efficiency of waste heat recovery boiler is raised up to 66.02%.
Moreover, the import exergy flow cost of the three different equipment is
reduced to 0.0329 RMB/MJ, 0.1304 RMB/MJ and 0.0002 RMB/MJ, respectively.
A comprehensive design, optimization and development methodology of a wasted heat recovery boiler using serrated fins and extensive surface in a bulky CCPP
