Technical review of the slow-flow grain buffer section in low-temperature rice dryers

This study investigates the structural design and operational dynamics of an intermittent rice dryer, with a focus on the integrated slow-flow grain storage section used in grain processing. The system comprises two distinct chambers: one for active drying and another for moisture equalization, which protects grains from direct exposure to hot air. Heated air flows through the grain bed, promoting internal moisture diffusion and gradual surface evaporation. While effective for improving drying uniformity, the continuous movement of both air and grains introduces risks of mechanical stress and damage. This paper examines airflow patterns, tray configurations, and temperature gradients within the storage section, emphasizing their role in balancing drying efficiency with grain integrity. By synthesizing insights from experimental studies, computational modeling, and sensor-based control technologies, this research highlights engineering strategies to enhance post-harvest quality and reduce losses in rice production systems, particularly under high-humidity subtropical conditions. This review summarizes current advances in moisture equalization strategies within intermittent dryers and proposes design considerations for the grain buffer section to support future innovation in this area.