THERMODYNAMIC EVALUATION IN INTEGRATED DESIGN OF CALCINER AND CARBONATOR FOR CALCIUM LOOPING PROCESS AT CEMENT PLANT

• Main Author: Aulia Sulaeman, Tia
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83031
• Institution: Institut Teknologi Bandung

Calciners in cement factories are critical components, especially in the decomposition of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2) due to the heating or calcination of raw mix cement materials. Carbon dioxide (CO2) in cement factories contributes to greenhouse gases (GHG). Therefore, an integrated system was created between conventional cement plants with calcium looping (CaL) cycles to reduce CO2 emissions in cement plants. The CaL cycle is used to capture CO2 by CaO and form CaCO3 as raw mix for cement. The CaL cycle reduces CO2 emissions, so the integration process with conventional cement systems needs to be well calculated, especially for raw mix particles, calciners, and carbonators. The integration parameters of CaL in raw mix particles are the average diameter and logarithmic temperature difference, while for calciners and carbonators are the heat transfer coefficient (U), calciner dimensions, carbonation factor, and mass balance after integration with the CaL cycle. The calciner in the CaL cycle uses pure air for fuel combustion, so it is called oxy-calciner. The calciner dimension of the CaL cycle is calculated based on its heat transfer coefficient and CO2 emission, while the carbonator’s dimensions are determined based on the same volume as the calciner but with a smaller diameter. The mass balance and energy for the integrated system are determined based on the carbonation factor and calcination percentage of raw mix. In this study, on raw mix particles with an average diameter of 3.28 ?m and an average heat transfer coefficient of 4 W/m2 K, the resulting calciner dimensions are 9.6 m in diameter and 25 m in height.