Iranian Chemical Engineering Journal

Iranian Chemical Engineering Journal

Investigation of Effective Factors in Reducing Energy Consumption of Magnesium Carbonate Calcination Process

Document Type : Original Article

Authors
1 MSc. of Chemical Engineering, University of Sistan and Baluchestan
2 Professor of of Chemical Engineering, University of Sistan and Baluchestan
3 Assistant Professor of Chemical Engineering, University of Sistan and Baluchestan
Abstract
This study focuses on the recovery of waste heat from the shell and exhaust gases of the rotary kiln used for calcining magnesium carbonate at the Iranian Refractories Procurement Production Complex.
The amount of waste heat from the rotary kiln was calculated to be 565.82 kW. In the first proposed scenario, several heat exchanger tubes were installed around the kiln shell to utilize the waste heat for heating the unit's buildings. An economic analysis revealed that the investment cost of this design could be recovered within six years through savings in diesel fuel consumption. Eliminating diesel fuel usage for winter heating not only reduces environmental pollution but also significantly decreases the unit’s operational costs. In the second proposed scenario, the waste heat from the kiln's exhaust gases was utilized for electricity generation via a Rankine cycle (RC) employing ammonia and water as working fluids. The cycle was simulated using Aspen HYSYS software. The results showed that the electricity generated in the Rankine cycle over a 24-hour period was 734.9 kW using ammonia as the working fluid, and 115.37 kW using water as the working fluid. Furthermore, the cost of electricity generation was 33,750 Toman per kWh for ammonia and 285,000 Toman per kWh for water. A comparative analysis demonstrated that ammonia, in terms of energy efficiency, exergy efficiency, and electricity production cost, is a more suitable working fluid for this application compared to water.
Keywords

 

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