摘要：Unsatisfactory inlet structure of a downer can directly lead to uneven gas鈥搒olid distribution, poor mixing effect, insufficient heat transfer, and affect the coal pyrolysis efficiency. In response to the above issues, a 3D model of a novel downer with swirling blade nozzle (DSBN) was developed to predict the particle mixing behavior, field synergy characteristics, and thermal contribution mechanism. Additionally, the effects of blade structural parameters on the coal concentration, field synergy, and heat transfer characteristics were comprehensively discussed. Results indicate that the coal volume fraction, temperature, temperature uniformity (U), and mixing index (IM) of DSBN are all higher than conventional downer (CD). The synergistic angle enhancement factor 尾伪average has reached 58.95 %, indicating that swirling blades significantly reduce flow drag and pressure drop, reducing energy dissipation. For thermal mechanism contribution, gas鈥搒olid convective accounts for 73.41 %, thermal radiation accounts for 26.585 %, and solid鈥搒olid collision conduction accounts for 0.005 %. For the design of blade number (N) and angle (胃), regardless of coal concentration effect, U, synergy angle, and heat transfer are all N = 8, 胃 = 90掳 is the optimal design solution. When blade length L = 150 mm, the coal volume fraction, U, and heat transfer coefficient are optimal. Considering synergy, the optimal length is 100 mm. 漏 2024 Elsevier Ltd

ISSN号：0016-2361

卷、期、页：卷375

发表日期：2024-11-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Fuel

参与作者：Du, Jiali,Zhang, Lingjie,Wu, Feng

第一作者：王军武

论文类型：期刊论文

论文概要：Du, Jiali,Zhang, Lingjie,Wu, Feng,王军武，CFD simulation of a novel downer with swirling blade nozzle: Field synergy characteristics, heat transfer contribution and structure optimization analysis，Fuel，2024，卷375

论文题目：CFD simulation of a novel downer with swirling blade nozzle: Field synergy characteristics, heat transfer contribution and structure optimization analysis