Thermodynamic Analysis of a Rotating Fluidized Bed in Static Geometry Dryer : Waste Heat Recovery and Re-Utilization

Energy system deals with a quantitative assessment of operations, and exergy provides a qualitative evaluation of system processes. Hence, a productive thermodynamic evaluation is essentially required in the pertinent design and optimization of the developed system. The present study covers the energy-exergy analysis of drying operation in an RFB-SG dryer and mathematical analysis of the heat recovery unit. The energy utilization (EU) and energy utilization ratio (EUR) are studied for distinct operating parameters, such as the airflow rate, inlet air temperature, and solid loading capacity. The energy utilization and energy utilization ratio are observed to be increased with the increase of the AFR, air temperature, and inventory. The EU and exergetic efficiency are also improved using air inlets of rectangular cross-sections compared to a circular one. Similarly, EU and EUR are increased in the RFB-SG dryer without slit compared to a RFB-SG dryer with-slit. In addition, using a heat exchanging device the large amount of energy is re-utilized by 29.7%, 34%, and 41% at temperature of 53°C, 58°C, and 64°C, respectively