1. Project Background
Conventional transfer lines for Solid Recovered Fuels (SRF) alternative fuels rely mainly on manual feeding. Imperfect manual operation and inadequate equipment often lead to uncontrolled fugitive dust dispersion, filling the workshop and plant with combustible dust. In contrast, automated equipment enables precise containment of dust emissions via fully enclosed conveying and unloading machinery to eliminate dust leakage. Furthermore, negative pressure control technology is deployed during operation to extract and capture dust at source, minimizing worker exposure hazards and mitigating on-site fire and explosion risks.
2. Solutions from Sequoia
2.1 Applicable Feedstock Types
- Biomass
- Wood chips / Wood lumps post primary crushing
- Straw
- Rice husks
- Alternative Fuels / SRF (Solid Recovered Fuels)
2.2 Design Principles
- The silo can receive feedstock at a designated feeding rate (X t/h) while discharging the same material at a separate output rate (Y t/h) simultaneously.
- Material follows the First-In, First-Out (FIFO) flow principle.
2.3 Main Equipment Components
- Floor Module
a. Drive Unit
b. Inclined Protective Shield
- Spike Rolls
a. Bearings
- Leveling Screw Conveyor
a. Supports & Bearing Assemblies
- Gear Motors
- Rotational Speed Sensors
- Radar Level Sensors (Millimeter-wave Type)
- Support Legs & Wind Bracing
- Silo Wall Panels
- Maintenance Access Door
- Leakage Collection Trays
- Hydraulic Power Unit (HPU)
- Fire Suppression System
2.4 Component Descriptions
2.4.1 Drive Unit
Bottom-mounted drive assembly for walking/moving floor operation
2.4.2 Spike Rolls
We develop multiple customized spike roll configurations to match diverse conveying feedstock characteristics.
2.4.3 Bearings
Premium bearings from SKF, NSK and Timken are adopted to extend the overall service life of the whole system.
2.4.4 Hydraulic Power Unit (HPU)
HPU supplied for the Maanshan Project in partnership with CRCC.
This hydraulic power unit converts electric power into hydraulic power using ISO VG46 mineral hydraulic oil (viscosity: 46 mm²/s @ 40°C). The load-sensing axial piston pump and matching driving motor are mounted on a detachable top cover alongside the valve manifold. The manifold integrates on-off valves and proportional DC valves to regulate oil flow and adjust system operating speed.
moving floor drive unit
We deliver custom hydraulic station designs with waterproof, dust-explosion-proof and gas-explosion-proof certifications.
2.4.5 Ongoing Projects
2.4.6 Optional Leakage Collection Trays
Leakage trays capture most permeated leachate passing through the floor module, protecting support structures and surrounding areas from contamination.
The trays feature a steel framework lined with polyethylene sheets; adjacent polyethylene panels are welded with targeted inclinations to guide leaked solids and liquids to the drainage network.
3. Integrated Silo & Dust Removal Engineering Practice
For the Maanshan project, we implemented an innovative integrated silo-dust removal system design, limiting dust emission concentration to below 10 mg/Nm³.
In addition, compact structural layout realizes full integration of unloading, silo storage, discharging and dust abatement equipment within a minimal footprint.
The corresponding process flow diagram is shown below.
This innovative integrated silo and dust removal system has also been applied in our latest construction projects, guaranteeing outlet dust concentration below 10 mg/Nm³. The compact layout consolidates unloading, silo storage, discharging and dust treatment units to save significant floor space.
4. Summary
Selecting a well-matched material handling system greatly improves overall plant operational efficiency. Our silo solutions deliver cost-effective, low-maintenance storage and conveying performance for all your bulk material handling requirements.
An expert in pyroprocess and solidwaste recovery . Responsible for the Marketing and Support of Sequoia Industrial with over 14 years in this field. I am determined that our sustainable products and services will be at the forefront of the solution for the generations to come.
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