A  exergoeconomic analysis makes it possible to determine the part of the destruction of exergy and the total investment costs that can be avoided. In this work, the performance of the components of a dry process cement production plant of 151 Ton / h was studied by energy, and conventional and advanced exergy and exergoeconomic analysis. The components of the plant are: a raw material mill, a process tower, a calciner, a rotary kiln, a clinker cooler, a coal mill and a cement mill. The following considerations were assumed for the energetic and exergetic analysis  of each component: The system assumes a steady flow at steady state, the temperature and pressure in the environment are 25 ° C and 101.325 kPa respectively, the changes in the kinetic and potential energy of the input and output material are negligible, the gases within the system are assumed as ideal, the combustion reaction in the furnace is complete, no heat is transferred to the system from the outside, the electrical energy produces work on the axis of the system or component, the lower calorific value (LHV) of the fuel was used, since the water in the exhaust is in a vapor state and the average surface temperatures of the furnace and the environment are constant throughout the study period. In this paper, the exergy destruction and the investment costs of the units of the system were divided into unavoidable and avoidable parts to obtain accurate information about the performance of the process. The energy and exergy analisys results showed that the raw material and cement mills have first law efficiencies that do not exceed 60% and the calciner and rotary kiln units are the ones with the highest heat rejection with a percentage of 55.94 and 36.55% respectively. The greatest exergy destruction occurs in the calciner, rotary kiln and raw material mill where 40.16%, 32.05% and 14.89% of total exergy destruction are destroyed, respectively. The conventional exergoeconomic analysis results showed that the total cost of exergy destruction is 4282236 USD/h. The 62% of the total cost of the exergy destruction is caused by the calciner and the rotary kiln.  The lowest values of the exergoeconomic factor were calculated for calciner (0.01%), clinker Cooler (0.01%), rotary kiln (0.02%) and raw mill (0.04%) and the high difference in relative cost were calculated for Calciner (42%) and rotary kiln (54.21%). from the advanced exergoeconomic analysis, it is obtained that only 12% of the exergy destruction costs can be avoided and the components with the highest avoidable non-exercise costs are calciner and rotary kiln which implies that this equipment’s should be considered for an investment which allow the decrease of the exergy destruction cost and the increase of the exergetic efficiency.  


Exergoeconomic Analysis in a Cement Production Plant

Division / Sponsors: 
Aerospace, Bioengineering, Applied Mechanics, Design Engineering Division, Advanced Energy Systems, Manufacturing Engineering Division, Noise Control and Acoustics, Nondestructive Evaluation, Diagnosis, and Prognosis (NDPD), Nuclear Engineering Division, Process Industries Division, Fluids Engineering, Heat Transfer, Materials, Microelectromechanical Systems, Safety Engineering and Risk Analysis, Computers & Information in Engineering


Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2020/volume/84478

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