Numerical and experimental study of integral multi-jet structure impact on gas-solid flow in a 3D spout-fluidized bed

Wu, Feng; Yang, Chunling; Che, Xinxin; Ma, Xiaoxun; Yan, Yuan; Zhou, Wenjing

doi:10.1016/j.cej.2020.124737

Cited by 25 publications

(6 citation statements)

References 45 publications

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“…To further understand the mechanism of the swirl effect in a spouted bed, particle image velocimetry was used to study the cross-sectional flow field of particles with different bed structures at the same height. The experimental setup is shown in the study by Wu et al 41 It can be found that under the action of the swirling blades, the radial disturbance on the gas−solid two-phase flow in the spouted bed can be increased by the swirling effect. The results are shown in Figure 12.…”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation of the Swirl Flow Enhancement Effect on the Particle Drying Process in a Novel Spouted Bed

Duan

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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The swirl flow effect was introduced in the spouting bed to change the velocity and volume distribution of the gas phase in different directions, strengthen the radial disturbance, increase the contact area, and optimize the mass transfer, heat transfer, and transmission efficiency of the two-phase flow in the spouted bed. The drying efficiencies of a conventional spouted bed and a spouted bed with an integral swirling blade nozzle (ISBN) under various particle diameters, filling weights, and drying temperatures were experimentally studied. It was found that under the same conditions, the drying activation energy of the ISBN increased, the drying time was shortened, the drying rate increased, the moisture diffusion in the bed accelerated, and the unit energy consumption decreased. When T = 70 °C, d = 1.5 mm, and m = 66 g, the ISBN drying efficiency was the highest.

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Section: Methodsmentioning

confidence: 99%

Experimental Investigation of the Swirl Flow Enhancement Effect on the Particle Drying Process in a Novel Spouted Bed

Duan

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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“…It was concluded that when the inlet angle of the cyclone was 45°, the tilt angle was 86°, and the ratio of the inner and outer diameters was 0.526, the blade had the smallest hindrance to the inlet gas, and the particle velocity flow field uniformity was better. For the IMJSFB, 43 the influence of multijet structures on the gas−solid flow was studied using a combination of numerical and experimental methods. The addition of jets boosted the production of a large number of vortices.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Effect of Three Novel Strengthening Components on Water Evaporation in 3D Spouted Beds

et al. 2021

Ind. Eng. Chem. Res.

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The hydrodynamics of the gas–solid two-phase flow and vaporization of the water phase in an integral multijet spout-fluidized bed (IMJSFB) and spouted beds with spherical longitudinal vortex generators (LVGs) and an integral swirling blade nozzle (ISBN) was numerically simulated. These three novel strengthening components are adopted for the strengthening of the radial mixing of particles, promoting the uniformity of the flow field velocity distribution, and increasing the water vaporization rate. The simulation results show that the three novel strengthening components can promote the uniformity of fluid flow velocity distribution in beds, and the promotion effect is arranged in descending order as follows: LVGs > swirling blades > multijet. In the case of water vaporization, the LVGs, swirling blade, and multijet mainly promote the vaporization of water near the generators, in the spout zone, and the zone near the side nozzles, respectively. Among them, the swirling blade contributes the most to water vaporization, followed by the multijet and then LVGs. In addition, when the gas inlet velocity and temperature are 11.2 m/s and 520 K, respectively, water vaporization is most obviously boosted.

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“…Moreover, other operational parameters of IMJSFB were not considered for analysis in our previous work. 31 The aim of the present study was to analyze the mechanism behind the enhancement effect on the radial movement of particles in the IMJSFB. Particle image velocimetry (PIV) 37 was employed to analyze the effects of multi-jet structure, depths of static bed, and particle diameter on the radial velocity and turbulence fluctuation of particles in the IMJSFB.…”

Section: Introductionmentioning

confidence: 99%

“…The radial mixing of gas and particles between the spout and annulus zone is inadequate. − The particles in the annulus region flow slowly and stick to the wall of the bed, resulting in poor mass and heat transfer in the bed. Many optimizations have been implemented to reduce the dead zone at the bottom of the annulus and to fluidize particles in the annulus of the spouted bed to address the limitations of conventional spouted beds. − Zhong et al − experimentally delved into the hydrodynamic behavior in a two-dimensional spout-fluid bed with a cross section of 300 mm × 30 mm and a height of 2000 mm. They also studied the spout behavior of a visible pressurized cylindrical spout-fluid bed (I.D.…”

Section: Introductionmentioning

confidence: 99%

“…Estiati et al studied the capacity of the fountain confiner to avoid fine particle entrainment, and its effect on hydrodynamics has been assessed for systems without draft tubes and with open-sided and nonporous draft tubes. Wu et al , numerically simulated the effects of side jet number and side jet width on gas–solid two-phase flow in the integral multi-jet spout-fluidized bed (IMJSFB) and preliminary experimental analysis of gas–solid two-phase flow in a 3D IMJSFB. Moreover, they delved into the radial mixing behavior in a spouted bed with longitudinal vortex effects by experimental and numerical methods. − …”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic Behavior of Particles in a 3D Integral Multi-Jet Spout-Fluidized Bed

Yang

Hui

et al. 2020

ACS Omega

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The hydrodynamic behavior of particles in a 3D integral multi-jet spout-fluidized bed has been studied experimentally by particle image velocimetry method. In the cross section of the spouted bed, especially in the annulus, it was found that particle movement can be effectively promoted by adding the integral multi-jet, thus enhancing the radial movement of particles in the annulus and effectively eliminating the dead zone of particle flow in the annulus region. With the decrease of particle handling capacity, the fluidization effect of multi-jets was improved. When the static bed depth was 0.165 m, the enhancement effect of multi-jets on the movement of particles in the spouted bed would be optimal. When the particle diameter was overly small, the fluidization effect of the side jet would be relatively low, while excessive particle diameter would weaken the fluidization effect of the side jet due to the rise in the inertia force of particles. The analysis of the average turbulent kinetic energy and radial velocity of the particles revealed that when the particle diameter is equal to 0.72 mm, the strengthening factor of movement of particles (η) reaches the peak, the turbulence fluctuation of particles in the annulus region reaches the highest, and the fluidization effect of side jets on the particles is the best.

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Numerical and experimental study of integral multi-jet structure impact on gas-solid flow in a 3D spout-fluidized bed

Cited by 25 publications

References 45 publications

Experimental Investigation of the Swirl Flow Enhancement Effect on the Particle Drying Process in a Novel Spouted Bed

Experimental Investigation of the Swirl Flow Enhancement Effect on the Particle Drying Process in a Novel Spouted Bed

Numerical Study on the Effect of Three Novel Strengthening Components on Water Evaporation in 3D Spouted Beds

Hydrodynamic Behavior of Particles in a 3D Integral Multi-Jet Spout-Fluidized Bed

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