DEM Simulation — Particle Velocity Visualization
System Details & Operating Parameters
| Parameter | Discharge Conveyor (BCN-02) | Feeding Conveyor (BCN-3A) | Unit |
|---|---|---|---|
| Bulk Material | Coal | Coal | — |
| Belt Speed | 4.68 | 4.68 | m/s |
| Belt Width | 1,800 | 1,800 | mm |
| Troughing Angle | 45 | 45 | degrees |
| Rated Capacity | 4,000 | 4,000 | TPH |
| Design Capacity | 4,400 | 4,400 | TPH (Des.) |
| Simulation Time | 9.25 | 9.25 | seconds |
| Analysis Software | EDEM (DEM Solutions) | — | |
Executive Summary
This case study presents a Discrete Element Method (DEM) simulation study of the transfer chute system connecting the BCN-02 discharge conveyor to the BCN-3A feeding conveyor. The analysis was performed using EDEM software to evaluate bulk coal material flow behavior, verify belt loading conditions, identify high-impact wear zones, and assess the overall operational stability of the chute design at the rated capacity of 4,000 TPH (design capacity 4,400 TPH).
The DEM simulation at time t = 9.25 s demonstrates stable, continuous material flow through the chute under both the existing and proposed geometry configurations. Particle velocity distributions and flow patterns are captured using the EDEM solver with a comprehensive velocity color-map ranging from 0.00 m/s to 8.50 m/s.
Study Objectives
The DEM simulation study was conducted with the following primary objectives:
DEM Simulation Observations
Stable Continuous Material Flow
DEM results confirm continuous and uninterrupted coal particle flow from the BCN-02 discharge through the curved chute body onto BCN-3A. No material hang-up, bridging, or blockage events are observed within the simulation time window of 9.25 s. The flow stream is well-guided by the chute geometry.
Controlled Material Trajectory
The material trajectory through the chute is fully controlled. The velocity color-map shows a well-defined particle stream transitioning from moderate (green, 2.83–5.67 m/s) at the upper chute entry to peak velocity (red/orange, 7.08–8.50 m/s) at the impact zone, decelerating to match belt speed (4.68 m/s) upon loading. Rebound is minimal, reducing dust generation.
Localized Impact & Wear Zone Identification
High-velocity particles (7.08–8.50 m/s, red zone) are concentrated at the chute lower transition bend and loading point. This localized impact zone indicates accelerated liner wear potential. Peak particle velocities up to 8.50 m/s are recorded at this region, requiring abrasion-resistant liner protection for long-term service life.
Centralized Belt Loading
Material deposits centrally onto the BCN-3A receiving belt with a uniform burden profile. The low-velocity particles (black/dark green, 0.00–1.42 m/s) visible on the conveyor belt confirm effective deceleration and proper loading. Minimal off-centre loading is observed, which reduces belt edge stress and mistracking risk.
Velocity Analysis — Particle Velocity Profile
The EDEM simulation captures particle velocities across the full transfer path. The velocity color-map (0.00 – 8.50 m/s) reveals distinct flow zones: stable low-velocity flow on the conveyor belts, controlled mid-velocity flow in the chute body, and localized peak velocities at the impact zone.
Performance Evaluation Matrix
Problem Statement & Root Cause Analysis
The DEM simulation was initiated to validate the redesigned transfer chute following operational concerns with the previous chute configuration. The table below summarizes identified issues and their root causes:
| Issue | Root Cause | Status (Current Design) |
|---|---|---|
| Excessive chute wear | Direct high-velocity particle-wall impact | Mitigated — localized |
| Uncontrolled material trajectory | Absence of trajectory guidance geometry | Resolved — controlled flow |
| Material build-up risk | Insufficient flow area at transition bends | Low — no blockage observed |
| Dust generation | Turbulent flow and particle rebound | Low — reduced rebound |
| Non-uniform belt loading | Poor discharge stream alignment | Improved — centralized |
| High maintenance frequency | Concentrated wear at unprotected zones | Pending liner installation |
Engineering Recommendations
Wear Protection — Abrasion-Resistant Liners
Install abrasion-resistant (AR400/AR500 grade) ceramic or chromium carbide overlay liners at the following locations:
- Lower chute impact zone (primary wear location — peak 8.50 m/s)
- Chute curved transition section (secondary wear zone — 6.5–7.0 m/s)
- BCN-3A conveyor loading point and skirting region
Maintenance Access — Inspection Doors
Incorporate hinged inspection doors to facilitate routine inspection and liner replacement without major dismantling at:
- Upper chute section (entry zone below head pulley)
- Impact region at the lower transition bend
- Loading zone above BCN-3A belt
Dust & Spillage Control
Although dust generation is rated low in this simulation, the following measures are recommended:
- Install rubber skirting seals along BCN-3A loading zone (minimum 1.5 m length)
- Seal all chute wall gaps and access openings to contain fine coal particles
- Consider local dust extraction/suppression if fine coal fraction is high
- Monitor spillage weekly and adjust skirt tension accordingly
Future Capacity Optimisation
The current design is validated for 4,000 TPH rated / 4,400 TPH design capacity. Should throughput exceed 4,400 TPH, an additional DEM study is recommended to reassess:
- Particle impact forces and revised wear zone extents
- Belt loading profile and burden height at higher feed rates
- Blockage risk and chute geometry modifications if required
Conclusion
The DEM simulation of the BCN-02 to BCN-3A coal transfer chute system, conducted using EDEM software at t = 9.25 s, demonstrates that the current chute design performs at a high level under the specified operating parameters (4.68 m/s belt speed, 1,800 mm belt width, 4,000 TPH rated / 4,400 TPH design capacity).
Key findings confirm: (1) continuous and stable material flow with no blockage events; (2) controlled particle trajectory with minimal rebound and dust generation; (3) centralized belt loading with uniform burden distribution; and (4) localized wear zone at the lower transition impact region requiring liner protection. The overall performance rating of 8.5 / 10 confirms the chute design is suitable for industrial operation.