摘要
喷动床凭借其能在反应器尺度上实现颗粒稳定循环的特点,被广泛应用在储能颗粒制备等领域。然而,颗粒的循环运动会受到操作条件、容器尺寸等条件的影响,导致床层放大困难。研究思路在于摒弃垂直独立喷动的理念,将双喷口协同作用作为基本单元并开展喷动床放大设计。研究表明,在二维和三维矩形喷动床中,双喷口协同偏转喷动具备更高的气固混合效率与更宽的操作区间。二维喷动床内气固混合20 s后,双喷口比单喷口的温度下降同比提升了12%,且颗粒温度方差降低,展现出更强的均匀性。当双喷口流化床纵向扩展为四喷口时,极易出现腾涌状态。通过适度降低气体速度至1.75~2.0 m/s,四喷口喷动床可以实现多喷口独立垂直喷动,并具有优良的气固混合效果。本研究深入揭示了双喷口协同喷动单元在喷动床放大过程中的重要价值,为矩形喷动床的放大设计开辟了新路径。
The spouted fluidized bed has been widely applied in the fields such as the preparation of energy storage particles due to its ability to achieve stable particle circulation at the scale of the reactor.However,the circulation of particles is affected by operating conditions,container size and other conditions,which makes it difficult to scale up the bed.The idea of this paper is to abandon the concept of vertical independent spouting,and instead the use of the coordinated spouting dual nozzles as the basic unit to scale-up the bed.The research shows that in two-dimensional and three-dimensional rectangular spouted bed,the coordinated deflected spouting of dual nozzles has a higher gas-solid mixing efficiency and a wider operating range.After 20 seconds of gas-solid mixing in the two-dimensional spouted bed,the temperature drop of the dual nozzle compared with the single nozzle increased by 12%,and the variance of particle temperature decreased,demonstrating stronger uniformity.When the dual nozzle bed is longitudinally expanded to four nozzles,a slugging fluidized state is very likely to occur.By moderately reducing the gas velocity to 1.75-2.00 m/s,the four-nozzle spouted bed can achieve independent vertical jet movement of multiple nozzles and has an excellent gas-solid mixing effect.This study deeply reveals the important value of the coordinated spouting unit of dual nozzles in the scaling-up of the spouted bed,and opens up a new path for the scaling-up design of rectangular spouted beds.
作者
岳远贺
赵微微
侯林杰
张勇
饶中浩
YUE Yuanhe;ZHAO Weiwei;HOU Linjie;ZHANG Yong;RAO Zhonghao(Hebei Engineering Research Center of Advanced Energy Storage Technology and Equipment,School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Hebei Key Laboratory of Thermal Science and Energy Clean Utilization,School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)
出处
《化工学报》
北大核心
2025年第11期5664-5676,共13页
CIESC Journal
基金
国家重点研发计划项目(2022YFB3806503)
河北省自然科学基金项目(E2023202248)。
