อุทกพลศาสตร์ของสารป้อนผสมในเครื่องฟลูอิไดซ์เบดแบบหมุนเวียน

• Main Author: สมชาย สวยสอาด
• Other Authors: สุชญา นิติวัฒนานนท์
• Format: Theses and Dissertations
• Language: Thai
• Published: จุฬาลงกรณ์มหาวิทยาลัย 2004
• Subjects: ฟลูอิไดเซชัน; ชีวมวล
• Online Access: https://digiverse.chula.ac.th/Info/item/dc:35528

An experimental study of hydrodynamics of mixed feed in a circulating fluidized bed was carried out in a cold flow plexiglas reactor. Tests were conducted in a circulating fluidized bed riser having a diameter of 5 cm. and 2.0 m. height and downcomer with a diameter of 0.10 m. and 1.2 m. height. Four solids (sand, sawdust, rice husk and bagasse) were selected in this experiment. The average particle sizes were 250-425 micrometre. The particle densities were of 2312, 1583, 1484 and 630 kg/qb.m., respectively. The effect of air flow rate on particle velocity and pressure in CFB riser were studied. The range of air flow rate was 300-500 l/min. The pressure data obtained from the experiment can be used for determining the voidage in riser column. A CCD camera with Image Pro Plus V4.5.1 program was used to find the particle velocity. It was found that particle velocity and pressure decreased along the riser at constant air flow rate. At the same position, the particle velocity increased with the increasing of air flow rate whereas voidage decreased so that the particle at the lower part was denser than the upper part. It can be seen that an increased solid circulation fluxes results in an increase in the solid holdup. The solid hold up along the riser of sand/saw dust mixer was higher than sand/rice husk mixer, when superficial gas velocity is fixed. In addition, sand velocity was lower than mixer velocity and sand/saw dust mixer velocity was highest