# Application of EDEM Simulation for Calculating and Optimizing a Closed Coal Fly Ash Screw Conveyor
## 1 Introduction
in 2022 introduced a structural optimization design of screw conveyors, which involved an examination of several model screw conveyors followed by the selection of the most optimized design [10]. The calibration and validation of materials within DEM have garnered significant attention from researchers. In 2017, [PERSON] presented a comprehensive review paper on the calibration of the discrete element method, outlining methodologies for calibrating specific parameters and addressing potential challenges for future studies [11]. Furthermore, a study by [PERSON] et al. in 2022 proposed a detailed approach for calibration and validation at a pilot scale, demonstrating remarkably meticulous execution and yielding results closely aligned with real-world observations, with a low margin of error [12]. These studies highlight the importance and complexity of calibration and validation in DEM research. In 2017, [PERSON] et al. conducted a study on resonant linear vibratory conveyors, emphasizing the need for a detailed mathematical model to improve state observation accuracy and enhance performance and control quality. They derived the model from basic mechanical principles and built a simulation model based on these equations. They validated their findings by comparing them with experimental results from a real industrial vibratory conveyor [13]. In 2018, [PERSON] et al. focused on the development and enhancement of conveyor transport, specifically a specialized suspended belt conveyor with a load-carrying belt. They underscored the significance of reducing the mass of the conveyor's metal structure during the initial design phase. The study introduced a mathematical model for the linear-section metal structure of the conveyor with a suspended load-carrying belt. The findings emphasized that employing modern approaches, particularly optimization methods, in the design of the conveyor's metal structure leads to improvements in both weight and overall dimensions of the conveyor [14]. [PERSON] et al. 's study extensively explores the mathematical modeling and optimization of a single-roll gyratory shaft crusher, with a focus on its working chamber and executive body. Using differential equations and analytical expressions, the study identifies rational design parameters, encompassing the shape of the working chamber cheek, rotation speed, and productivity. The results demonstrate significant reductions in both torque and radial load, underscoring the effectiveness of the optimized parameters [15]. In this study, five main phases were undertaken: (1) Analysis of Coal Fly Ash Properties. (2) Application of [PERSON] theory, a swift VBA Excel calculation program was developed [16]. This program facilitated the selection of a set of technical dimensions that met the specified optimal capacity; (3) 3D modeling and simulation: A 3D model was constructed using SolidWorks software (2023 SP5) and then simulated in the EDEM software with coal fly ash in Vietnam; (4) manufacture of a real screw conveyor for experimentation at the Vinh Tan thermal power plant in Vietnam; (5) evaluation and comparison: Finally, a comprehensive evaluation and comparative analysis were carried out, comparing the results obtained from calculations, simulations, and actual tests. The objectives of this paper encompass the following: (1) To discern and implement a robust calculation and simulation methodology within the EDEM software prior to manufacturing, ensuring the avoidance of model failure and meeting all specified capacity requirements accurately from the very first attempt, thereby optimizing cost and time; (2) to provide a method for the calculation and simulation of coal fly ash materials, including approaches for experimentation, determination, and computation of material parameters; (3) ultimately, to elucidate the intricate correlation between speed and capacity within the realm of screw conveyors, thereby enhancing our understanding of the material-handling process.