EFFECT OF RISER GEOMETRY STRUCTURE ON LOCAL FLOW PATTERN IN A RECTANGULAR CIRCULATING FLUIDIZED BED
By using a high-speed video camera and particle image velocimetry (PIV) technique, the local flow properties of the solid-gas two phases flow were studied in a plexiglass rectangular CFB cold model with the a riser of 1.5×0.864×4.9m3. Measurements were carried out with transparent spherical glass bead between 0.1-0.425mm as bed materials and cold air as flow medium. The experimental results showed that the secondary air has an important influence on the particle velocity distribution. Because of the secondary air penetrating effect, the particle lateral movement was acute. In the dilute region, the outlet and the corner effect induced the defluxion of the particles movement and the core-annular distribution was broken. The closer to the outlet, the stronger the lateral velocity is. The obstruct of hanging screen reduced the furnace outlet effects between the hanging screen and the front wall, where the particle movement in the area was controlled by the gas flow and the constrain of the wall. High particle concentration areas were formed in the junction between the screen and the front wall and in the corner between the left wall and the front wall.
PIV rectangular CFB gas-solid two-phase flow secondary air Hanging screen
Chen Tian Qinhui Wang Zhongyang Luo Ximei Zhang Leming Cheng Mingjiang Ni Kefa Cen
State Key Laboratory of Clean Energy Utilization, Zhejiang UniversityHangzhou,310027, China State Key Laboratory of Clean Energy Utilization, Zhejiang University Hangzhou,310027, China
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
464-470
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）