Simulated pulsed flow of gas and particles in a horizontal oppose-pulsed gas jets of bubbling fluidized bed

Lin, Weigang; Qi, Guoli; Tao, Ming; Liu, Xuemin; Hassan, Muhammad; Lu, Huilin

doi:10.1016/j.apt.2018.09.035

Cited by 12 publications

(3 citation statements)

References 23 publications

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“…For small-scale modeling tests, it is virtually impossible to replicate all the physical and chemical processes of a full-scale industrial gasifier, but compared with industrial gasifier experiments, results from a great number of different small-scale cold-flow tests showed that reliable predictions could be made from the scaled-down model tests. [26][27][28][29] In this modeling test, to ensure that the experimental results are closer to the actual gasifier, some similarity criteria should be met: (1) the model furnace is a 1:15 scale version of a full-scale industrial gasifier, (2) the gas flows are in the second self-modeling region, (3) the ratios of the gas flow momentum values in the model furnace are equal to those in the actual gasifier, and (4) according to the Stokes criterion, pulverized coal in the gasifier should be modeled using solids with an average particle size of 1.2 mm due to their flow similarity. 16 Figure 2 shows a schematic diagram of the experimental system with a modeling ratio of 1:15.…”

Section: Experimental Systemmentioning

confidence: 99%

Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector

Song

Tang

Liu

et al. 2023

Asia-Pacific J Chem Eng

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Ende pulverized coal gasifier (EPCG), as a typical representative of circulating fluidized bed gasifier, has been widely used in gasification field. The return conduit of EPCG is generally not equipped with a feedback control device (FCD), which tends to result in a low solid circulation rate (Gs) and high unburned combustibles in fly ash. To address these issues, a new technique using the ejector as the FCD was designed to provide a stable pressure barrier and improve solid circulation. Preliminary thermal experiments demonstrated the feasibility of improving the EPCG with injector system. Currently, the specific mechanisms that contribute to further optimize this technology have not been systematically studied. Considering the large impact of ejector operation on solid circulation rate and stability as well as syngas production, this work adopts a gas/particle 1:15 cold EPCG bench to investigate the gas/particle flow and pressure variation characteristics before and after ejector operation and under different working medium pressures (Pp). When the ejector operates at the design pressure Ps = 0.187 MPa, the outlet pressure of the return conduit is slightly larger than the furnace bottom pressure, thus preventing the reverse gas flow at the furnace bottom. The particle velocity and concentration distribution in the furnace are basically consistent with that without the ejector, showing a similar central spout region and near‐wall annulus flow region. As Pp increases from 0.04 to 0.24 MPa, the average particle velocity in the return conduit increases from 0.95 to 2.4 m/s, the particle concentration decreases from 0.088 to 0.051, and the solid circulation rate increases from 0.37 to 0.53 kg/h. The ejector outlet pressure gradually increases, the inlet pressure decreases, and the pressure barrier provided by the ejector rises from 1052 to 3640 Pa. When Pp is 0.12 MPa, the ratio of GN2/Gair is 0.91%, which can achieve the purpose of continuous and stable pressurization with a small amount of nitrogen.

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Section: Experimental Systemmentioning

confidence: 99%

Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector

Song

Tang

Liu

et al. 2023

Asia-Pacific J Chem Eng

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“…Gidaspow [23] proposed a combination of the Wen and Yu drag model [28] (Equation ( 19)) for dilute systems (α f ≥ 0.8) and the Ergun model [29] (Equation ( 20)) for dense systems (α f < 0.8). This model has been successfully applied for the particle-fluid dynamics studies in different systems [11,30,31].…”

Section: Constitutive Equationsmentioning

confidence: 99%

“…Thus, this approach is commonly restricted to reduced scale equipment under low flow rates. On the other hand, the Euler-Euler approach has been successfully applied in the prediction of the fluid-particle dynamics in different processes [8,[11][12][13]].…”

Section: Introductionmentioning

confidence: 99%

Eulerian Multiphase Simulation of the Particle Dynamics in a Fluidized Bed Opposed Gas Jet Mill

Santos

Baluni²,

Bück³

2020

Processes

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The compressible and turbulent gas–solid multiphase flow inside a fluidized bed opposed jet mill was systematically investigated through numerical simulations using the Euler–Euler approach along with the kinetic theory of granular flow and frictional models. The solid holdup and nozzle inlet air velocity effects on the gas–solid dynamics were assessed through a detailed analysis of the time-averaged volume fraction, the time-averaged velocity, the time-averaged streamlines, and the time-averaged vector field distributions of both phases. The simulated results were compared with the experimental observations available in the literature. The numerical simulations contributed to a better understanding of the particle–flow dynamics in a fluidized bed opposed gas jet mill which are of fundamental importance for the milling process performance.

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Performance optimization and improvement of dust laden air by dynamic control method for jet pulsed filters

Çankaya

Özcan

2019

Advanced Powder Technology

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Simulated pulsed flow of gas and particles in a horizontal oppose-pulsed gas jets of bubbling fluidized bed

Cited by 12 publications

References 23 publications

Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector

Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector

Eulerian Multiphase Simulation of the Particle Dynamics in a Fluidized Bed Opposed Gas Jet Mill

Performance optimization and improvement of dust laden air by dynamic control method for jet pulsed filters

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