Experimental evaluation of parameters affecting the coating performance of urea seeds in a prototype bottom external mixing spray two-fluid nozzle fluidized bed granulator

Tabeei, A.; Keikhosravani, A.; Samimi, Abdolreza; Mohebbi-Kalhori, Davod; Zakeri, Mozhgan

doi:10.1016/j.cherd.2021.06.014

Cited by 5 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taking the opposite direction of the forward direction of the sprayer as the positive direction of the y-axis, and the limit position of the nozzle swinging counterclockwise as the positive direction of the x-axis, a coordinate system is established with the swinging center of the nozzle as the origin. The motion state of the seeds at the nozzle outlet is analyzed (Akhalaya et al, 2021;Cao et al, 2023;Liao et al, 2022;Tabeei et al, 2021).…”

Section: Establish Trajectory Equationmentioning

confidence: 99%

Study on the Uniformity of Spraying Seeds With 4bqd-40c Spraying Seeder Machine

Cao¹,

Guo²,

Fu³

et al. 2023

INMATEH

View full text Add to dashboard Cite

The working parameters of the pneumatic sprayer, such as the sprayer's attitude, working airflow, and spraying amount, have an impact on the evenness of seed distribution during the process of vegetation restoration on degraded grasslands . This article focuses on the 4BQD-40C pneumatic sprayer and analyzes the impact of the sprayer's forward speed, the airflow velocity at the sprayer's inlet, and the frequency of the sprayer's swinging nozzle on the spraying quality. The conclusion shows that: 1) the equation of the seed distribution trajectory of the sprayer was obtained, laying the foundation for subsequent research; 2) the swinging frequency of the nozzle is the key factor affecting the spraying quality of the sprayer, and the optimal swinging frequency of the nozzle corresponding to different forward speeds of the sprayer was obtained based on the established trajectory equation; 3) when the sprayer performs spraying operations with the optimized forward speed and swinging frequency, the trajectory of the sprayer's seed distribution was analyzed. It was found that when the nozzle swings at each optimal frequency, the trajectory of the seed distribution is the same, and the sum of the re-sprayed and missed areas in the seed distribution area is equal.

show abstract

Section: Establish Trajectory Equationmentioning

confidence: 99%

Study on the Uniformity of Spraying Seeds With 4bqd-40c Spraying Seeder Machine

Cao¹,

Guo²,

Fu³

et al. 2023

INMATEH

View full text Add to dashboard Cite

show abstract

“…10 The solution of coating material is sprayed onto heated fluidized particles, and the particles are dried to form a "layer-by-layer" or "agglomerating" growth mode, of which the former is preferred in the particle coating applications while the latter is preferred in the particle agglomerate applications. 11 The coated particles are usually characterized by thickness, morphology, and structure of the coating shells, 12 which are affected by various parameters, including the process parameters, 10,13−19 equipment geometry, 20−22 coating solution properties, 10,19,23,24 and seed particle properties. 10,20,25,26 It is widely recognized that the process parameters of fluidization and drying have a strong influence on particle coating.…”

Section: Introductionmentioning

confidence: 99%

“…The coated particles are usually characterized by thickness, morphology, and structure of the coating shells, which are affected by various parameters, including the process parameters, ,− equipment geometry, − coating solution properties, ,,, and seed particle properties. ,,, …”

Section: Introductionmentioning

confidence: 99%

Effects of Seed Particle Properties on Coating in a Wurster Fluidized Bed

Liu,

Guo,

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Fluidized bed coating is an efficient technology for creating outer shell layers of particles, where the formation of the shells is affected by various factors, such as raw material properties, process parameters, and equipment geometry. In this study, the effects of seed particle properties, including particle sizes, the mass of bed material, and particle density, on the properties of the coating shells are investigated. First, agglomeration tests are screened to determine the appropriate range of coating conditions within which a layer growth mode is established. Then, the coating tests are carried out, showing that, given the same fluidization number, by increasing the seed particle size or density or increasing the mass of bed material, the drying conditions are improved, resulting in a smaller porosity and denser structure of the coating shells. The coating uniformity is influenced by particle circulation. If the mass of the bed material is too small or the seed particle size or density is too large, the circulation uniformity of the seed particles is affected, which has a negative effect on the coating uniformity. Finally, the influencing mechanisms on shell porosity and particle uniformity are summarized, which can be helpful to the modeling of spray coatings in future studies.

show abstract