Multiphase flow patterns in entrained-flow slagging gasifiers: Physical modelling of particle–wall impact at near-ambient conditions

Troiano, Maurizio; Solimene, Roberto; Salatino, Piero; Montagnaro, Fabio

doi:10.1016/j.fuproc.2015.06.018

Cited by 24 publications

(4 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have shown that the particle size, wall temperature, degree of carbon conversion, and slag thickness affect the tendency of coal particles to deposit on slag walls. Troiano et al − investigated impact velocities, surface properties, and the effects of carbon conversion, confirming that carbon transition is critical to the particle impact-related momentum dissipation. Walsh demonstrated that slag thickness affects the probability of deposition on the wall with a fluid bed slag formation.…”

Section: Introductionmentioning

confidence: 99%

Study of the Deposition Characteristics of Particles on the Slag Wall of a Gasifier

Bai

Song

Wei

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In this work, the behavior of coal char particles adhering to the slag wall was studied. The effects of slag thickness and particle size on the restitution coefficient and probability of deposition were mainly discussed. In addition, the types of particle deposition were also classified. The results of exploring the effect of particle size on the coefficient of restitution show that the restitution coefficient of coal char particles hitting the slag wall surface has a complex dimensional effect, with a maximum and minimum coefficient of restitution occurring at the same particle size, a phenomenon referred to in this paper as the discrete effect. The minimum restitution coefficient greater than 0 is regarded as the critical restitution coefficient (ε f), and it is considered that particles with theoretical restitution coefficient higher than εf will bounce off the slag wall. With the particle diameter of 600 μm as the boundary, ε f first decreases and then increases. The maximum restitution coefficient increases with an increasing particle size of less than 600 μm and stays at a maximum value of 0.62 when the particle size is more than 600 μm. Moreover, the fragmentation of particles occurs at the particle size of 840–1600 μm. The discrete effect was also observed in the experimental data for the investigation of slag thickness, ε f increases with the increase of the slag thickness, and the maximum possible restitution coefficient does not change with the thickness of the slag. In addition, according to the statistics of the deposition probability, it is found that the smaller the particle size, the greater the deposition probability, the thicker the slag thickness, and the easier it is to deposit.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the Deposition Characteristics of Particles on the Slag Wall of a Gasifier

Bai

Song

Wei

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…For real ash particles, the rebound parameters are different to predict due to multiple factors affecting the collision process, for example, carbon conversion, temperature, impact velocity, surface properties, and structure. , A 2D model was developed to predict the rebound characteristic of ash particles in the boiler. , Research found that the shape and size of ash particles are practical reasons for deposition. Yang et al considered the influence of impact angle, incident velocity, particle properties, and furnace operation conditions on particle deposition.…”

Section: Introductionmentioning

confidence: 99%

Could the Rebound Characteristics of Oblique Impact for SiO₂ Particles Represent the Ash Particles?

Li,

Xie,

Dong

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Collisions between particles or with a surface have been widely applied, in which the restitution coefficients are the important parameter to describe the particle rebound behavior. SiO 2 particles are often used instead of ash particles in theoretical analyses; however, whether this is justifiable has not been confirmed. This paper compares the rebound characteristics of oblique impact for SiO 2 particles and ash particles by experimental and theoretical analyses. Based on the rigid-body theory, the tangential restitution coefficients, rebound angle-particle center, and reflection angle-contact path predicted by SiO 2 particles are basically in agreement with the experimental results for ash particles, especially at large impact angles. However, there is a slight error at 2.2 m/s as the velocity approaches the critical capture velocity.

show abstract

“…Even in suitable conditions, particle sticking does not occur by 100%. The third criterion was proposed in the ash/char particle capture sub-model by Montagnaro et al [13], in which the surface tension was considered. In this criterion, the Weber number (We) was adopted as the critical index, defined as the ratio of kinetic and surface tension energy.…”

Section: Introductionmentioning

confidence: 99%

A proposal of ore particle-wall sticking criterion during the flash ironmaking process

Yang

Shen

Cheng

et al. 2022

Ironmaking & Steelmaking

View full text Add to dashboard Cite

Particle-wall sticking is a common phenomenon in high-temperature ironmaking reactors, such as flash ironmaking furnaces. In this study, a new criterion for the reduced ore particles was proposed to predict the sticking propensity based on the components, morphology, and particle motion. A comprehensive computational fluid dynamics (CFD) model was also established, and a newly proposed sticking criterion was coded into the traditional gas-particle framework. The results show that the adhesion of particles is more likely to occur at the medium height on the hemispherical refractory wall, and there is a bias under the side-blowing gas flow. The study also shows that particle-wall sticking did not occur when the reaction temperature was below 1300°C, while more than half would stick to the molten slag surface at a higher temperature. However, the sticking propensity did not always increase at a higher experimental temperature because the intermediate products, such as FeO, can reduce viscosity.

show abstract

Multiphase flow patterns in entrained-flow slagging gasifiers: Physical modelling of particle–wall impact at near-ambient conditions

Cited by 24 publications

References 50 publications

Study of the Deposition Characteristics of Particles on the Slag Wall of a Gasifier

Study of the Deposition Characteristics of Particles on the Slag Wall of a Gasifier

Could the Rebound Characteristics of Oblique Impact for SiO₂ Particles Represent the Ash Particles?

A proposal of ore particle-wall sticking criterion during the flash ironmaking process

Contact Info

Product

Resources

About

Multiphase flow patterns in entrained-flow slagging gasifiers: Physical modelling of particle–wall impact at near-ambient conditions

Cited by 24 publications

References 50 publications

Study of the Deposition Characteristics of Particles on the Slag Wall of a Gasifier

Study of the Deposition Characteristics of Particles on the Slag Wall of a Gasifier

Could the Rebound Characteristics of Oblique Impact for SiO2 Particles Represent the Ash Particles?

A proposal of ore particle-wall sticking criterion during the flash ironmaking process

Contact Info

Product

Resources

About

Could the Rebound Characteristics of Oblique Impact for SiO₂ Particles Represent the Ash Particles?