THERMAL SCIENCE

International Scientific Journal

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Separate and combined integration of Kalina cycle for waste heat recovery from a cement plant

ABSTRACT
This article reports on using Kalina cycle for waste heat recovery (WHR) from a cement plant. Two design alternatives have been investigated using separate and combined WHR from the kiln, cooler, and preheater. Measurements and analysis have been performed to determine the waste heat from different stages of the cement manufacturing lines. The annual heat losses from the kiln surface, preheater, and the cooler are estimated as 79.23, 44.32, and 43.6 GWh at average temperatures of about 314, 315, and 254 ℃, respectively. Analysis and optimization of using Kalina cycle for Waste Heat Recovery (WHR) from the kiln shell, cooler and preheater to produce electricity have been carried out using ASPEN software. Parametric study has been carried out to determine the design parameters for Kalina cycle including turbine inlet pressure, mass flow rate, and ammonia water concentration. The value of net power output using combined WHR is about 7.35 MW as compared to 6.86 using separate WHR design with a total cost saving of about 23%.
KEYWORDS
PAPER SUBMITTED: 2021-04-18
PAPER REVISED: 2021-05-26
PAPER ACCEPTED: 2021-05-28
PUBLISHED ONLINE: 2021-07-10
DOI REFERENCE: https://doi.org/10.2298/TSCI210418230M
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