Abstract The hydrodynamics in a novel integral multi-jet spout-fluidized bed was simulated using both Eulerian-Eulerian approach and the kinetic theory of granular flows. The effect of side jet number and side jet width on gas-solid two phase flow in the integral multi-jet spout-fluidized bed (IMJSFB) was investigated. The CFD results show that when the number of side jet is greater than 1 (N = 2–5), a wave-like spout and stable spout structure is formed in the IMJSFB. Compared with simulation results in the single nozzle spouted bed, the profiles of particles' velocity and concentration along the radial direction in the IMJSFB become relatively flatter. The integral uniformity of particle velocity distribution in spouted bed can be enhanced by increasing δ/Di. The particle flow factor (η) decreases first and then increases with the increase of δ/Di, and η reaches its minimum value when δ/Di = 0.208. On the whole, there is a set of optimal design parameters of side jet (N = 4, δ/Di = 0.208), at which, the fluidization quality particle phase in spout-fluidized bed reaches the optimum state while the bypass fluidizing air supply auxiliary equipment is omitted. The fluidization quality of particles in annulus can be significantly enhanced in the IMJSFB while the bypass fluidizing air supply auxiliary equipment is omitted.

中文翻译：

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新型整体式多射流喷口流化床流体动力学数值模拟与优化

摘要 利用欧拉-欧拉方法和颗粒流动力学理论，对新型整体式多射流喷口流化床的流体动力学进行了模拟。研究了侧射流数和侧射流宽度对整体多射流喷流流化床(IMJSFB)气固两相流动的影响。CFD结果表明，当侧射流数量大于1（N=2-5）时，IMJSFB内形成波浪状喷口和稳定喷口结构。与单喷嘴喷射床的模拟结果相比，IMJSFB中沿径向的颗粒速度和浓度分布变得相对平坦。增大δ/Di可以提高喷射床中粒子速度分布的整体均匀性。颗粒流动因子（η）随着δ/Di的增大先减小后增大，当δ/Di=0.208时η达到最小值。总体上，存在一组侧射流优化设计参数（N=4，δ/Di=0.208），此时喷流流化床中流化质量颗粒相达到最佳状态，旁路流化空气供给省略辅助设备。IMJSFB可显着提高环空颗粒的流化质量，同时省去旁路流化空气供应辅助设备。喷射流化床中流化质量颗粒相达到最佳状态，省去旁通流化空气供给辅助设备。IMJSFB可以显着提高环空颗粒的流化质量，同时省去旁路流化空气供应辅助设备。喷射流化床中流化质量颗粒相达到最佳状态，省去旁通流化空气供给辅助设备。IMJSFB可以显着提高环空颗粒的流化质量，同时省去旁路流化空气供应辅助设备。