The commercial value of Refuse-Derived Fuel (RDF) and Solid Recovered Fuel (SRF) is determined entirely by the specifications of the end-of-taker. For cement kilns utilizing waste-to-energy co-processing, alternative fuels must meet strict chemical and physical parameters to prevent calciner destabilization and furnace corrosion.
Guoxin’s specialized high-calorific RDF production lines are engineered to transform heterogeneous Municipal Solid Waste (MSW) and Commercial & Industrial (C&I) waste into high-purity alternative fuels. Our process design guarantees a uniform <50mm particle size, moisture control under 20%, and mechanical chlorine isolation to maintain levels below 1%.
Process Logic: Meeting Strict Calciner Specifications
Producing cement-grade alternative fuel requires a shift from simple shredding to multi-stage material refinement. Our lines execute a precise mechanical sequence to extract high-value combustibles while rejecting damaging contaminants.
Stage 1: Moisture Attenuation & Size Screening
High-moisture organic fractions (food waste, soil) lower the calorific value and cause downstream clogging. Heavy-duty trommel screens isolate the wet fine fraction (<80mm) at the front end, ensuring only high-calorific dry materials (plastics, paper, textiles) proceed to the processing core.
Stage 2: Mechanical Chlorine Isolation & De-stoning
PVC plastics are the primary source of chlorine, which damages cement kiln liners. Our system integrates high-velocity air-knife separators that sort material by bulk density. Heavy inerts (stones, glass, PVC composites) are dropped, while light, low-chlorine polymers and paper are lifted into the fuel stream. High-gradient overbelt magnets simultaneously extract 99% of ferrous metals.
Stage 3: Specification Fine Shredding
The liberated dry fraction is fed via VFD-controlled dosing conveyors into single-shaft fine shredders. Equipped with calibration screens, these units reduce the material to a uniform <50mm or <30mm profile, ensuring the fuel can be pneumatically injected directly into the cement burner without bridging.
Technical Performance Benchmarks
Our integrated RDF production systems are engineered for 24/7 continuous industrial duty cycles, optimizing energy consumption per ton of finished fuel.
| System Configuration | Input Capacity (TPH) | Finished Fuel Grade | Target Calorific Value | Output Particle Size (P95) |
| RDF-Line 100 | 10 – 15 Tons/Hour | Commercial RDF | 14,000 – 16,000 kJ/kg | ≤ 80 mm |
| SRF-Line 200 | 20 – 25 Tons/Hour | Premium SRF / Cement Grade | 16,500 – 19,000 kJ/kg | ≤ 50 mm / ≤ 30 mm |
| SRF-Line 400+ | 40 – 50+ Tons/Hour | Premium SRF / Cement Grade | 17,000 – 20,000 kJ/kg | Custom Precision Spec |
Engineering for Minimum TCO (Total Cost of Ownership)
Shredding and separating abrasive waste streams incurs high operational expenses (OPEX). Guoxin mitigates these costs through targeted metallurgy and system automation:
- Four-Way Reversible Rotors: Secondary fine shredder blades utilize specialized alloy steel with four cutting edges, reducing consumable changeout frequency by 75%.
- PLC-Synchronized Dosing: The system automatically adjusts conveyor feeding speeds based on the real-time amperage draw of the primary and secondary shredders, preventing motor overloads and material jams.
- Modular Screen Access: Sizing screens can be hydraulically lowered or swung out, reducing cleaning and replacement times to under 45 minutes.
Complete Turnkey EPC Scope
We deliver fully integrated processing ecosystems, minimizing interface risks for project developers:
- Feedstock validation and moisture-content mass balance design.
- 3D spatial layout modeling to fit within existing industrial properties or greenfield sites.
- Centralized SCADA/PLC control networks for complete plant visibility.
- On-site mechanical installation, system balancing, and emissions-compliance training.
Request a Mass-Balance Calculation & Line Layout
Every waste matrix is unique. To receive a tailored technical configuration, calculated calorific estimations, and budget tracking for your RDF project, please submit your feedstock analysis.
Lead Project Engineer: Eve@guoxinmachinery.com
FAQ
Q1: How does the production line control the chlorine content in the final RDF?
A: Chlorine typically comes from PVC plastics and chlorinated rubbers. Our systems utilize multi-stage air density separation to remove heavy, rigid plastics and chlorinated polymers based on weight-to-surface-area ratios. For ultra-strict premium SRF contracts, we integrate automated near-infrared (NIR) optical sorters to target and eject PVC elements with high precision.
Q2: Why is moisture control critical for cement kiln alternative fuels?
A: High moisture dropped into a calciner lowers the flame temperature, increasing coal consumption and disrupting clinker chemistry. By separating wet organic fines via our front-end mechanical trommels, we maintain a stable input moisture level, maximizing the net calorific value (NCV) of the output fuel.
Q3: Can the system process both loose MSW and baled industrial plastics?
A: Yes. The front-end feeding system can be configured with automated bale-breakers and dosing hoppers. This ensures a steady, un-clumped material volumetric flow into the separation and sorting stages regardless of whether the incoming material arrives loose or compressed.
Q4: What is the average power consumption per ton of finished RDF?
A: Power consumption depends on the required output size. Reducing material to <80mm requires approximately 25–35 kWh/ton, whereas calibrating down to a premium <50mm cement-spec fuel using our single-shaft fine shredders averages 45–60 kWh/ton due to increased shearing requirements.