Rigidly-mounted roll mill as breakage tester for characterizing fine particle breakage

Böttcher, Ann-Christin; Thon, Christoph; Fragnière, Greta; Chagas, Anderson S. das; Schilde, Carsten; Kwade, Arno

doi:10.1016/j.powtec.2021.01.055

Cited by 9 publications

(2 citation statements)

References 38 publications

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“…As discussed in section 3.3, more effort should be dedicated to modeling the primary breakage function from single-particle breakage, given its central role in the application of the model in particular to discrete systems in DEM. One device that could be useful in this task is the rigidly-mounted roller mill, which crushes particles nearly individually between rigidly-mounted rollers with carefully controlled gaps (Böttcher et al, 2021). In spite of challenges in measuring the energy required to break particles contained in the finest sizes studied (45 μm), it provided good estimates of the size distribution of particles under stressing conditions that approach the minimum required for fracture (Campos et al, 2021).…”

Section: Breakage Testing and Model Fittingmentioning

confidence: 99%

Review and Further Validation of a Practical Single-Particle Breakage Model

Tavares

2022

KONA

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Particle breakage occurs in comminution machines and, inadvertently, in other process equipment during handling as well as in geotechnical applications. For nearly a century, researchers have developed mathematical expressions to describe single-particle breakage having different levels of complexity and abilities to represent it. The work presents and analyses critically a breakage model that has been found to be suitable to describe breakage of brittle materials in association to the discrete element method, either embedded in it as part of particle replacement schemes or coupled to it in microscale population balance models. The energy-based model accounts for variability and size-dependency of fracture energy of particles, weakening when particles are stressed below this value, as well as energy and size-dependent fragment size distributions when particles are stressed beyond it, discriminating between surface and body breakage. The work then further validates the model on the basis of extensive data from impact load cell and drop weight tests. Finally, a discussion of challenges associated to fitting its parameters and on applications is presented.

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Section: Breakage Testing and Model Fittingmentioning

confidence: 99%

Review and Further Validation of a Practical Single-Particle Breakage Model

Tavares

2022

KONA

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“…The most crucial step in the process of heterogeneous condensation is establishing a supersaturated vapor environment. Numerous studies have been conducted to promote the removal of fine particles based on the theory of heterogeneous condensation [25,26]. Fan et al [27] conducted numerical calculations to assess the influence of various factors on the distribution of the supersaturated vapor degree.…”

Section: Introductionmentioning

confidence: 99%

Study on the Efficiency of Fine Particle Removal in a Single-Tower Dual-Cycle Desulfurization Process Utilizing Heterogeneous Condensation

Zhang,

Mnipela,

Yang

et al. 2024

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This study investigated a new method for controlling the emission of fine particles through heterogeneous condensation. Specifically, the research focuses on the application of single-tower double-cycle desulfurization technology in the wet flue gas desulfurization process. The establishment of a supersaturation environment necessary for heterogeneous condensation was achieved by reducing the temperature of desulfurization slurry in the oxidation zone. Numerical simulations were used to study the distribution of the supersaturation degree and fluid dynamics characteristics in the desulfurization tower after the cooling of desulfurization slurry. Furthermore, the impact of single-tower double-cycle technology on the removal efficiency of fine particles was examined. The results of the numerical simulations indicate that cooling the desulfurization slurry in the absorption zone could establish a supersaturated vapor environment, with the supersaturation degree and region increasing as the slurry temperature decreases. Under typical operating conditions, a temperature drop of approximately 8~10 °C was found to be most suitable for the desulfurization slurry. Moreover, lowering the temperature of the desulfurization slurry in the absorption zone increases the supersaturation degree from 0.93 to 1.85. Additionally, the use of single-tower double-cycle desulfurization technology is shown to significantly enhance the removal efficiency of fine particles, particularly those within the particle size range of 0.1~1 μm. Ultimately, this method could increase the removal efficiency of fine particles from 39.9% to 57.9%.

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