Secondary Air Fan for Chain Grate Stoker Boiler – Precise Combustion Management
The secondary air fan for chain grate stoker boiler is engineered to deliver controlled secondary‑air flow that completes the combustion process, reduces unburned carbon, and improves overall boiler efficiency. Designed for medium‑ to large‑scale industrial boilers, this fan integrates seamlessly with existing stoker systems, providing reliable service under continuous‑duty conditions and harsh operating environments.
How It Works – Targeted Air Distribution
Secondary air is introduced downstream of the primary fuel feed, just above the moving grate. The fan creates a steady, adjustable airflow that mixes with the flue gases, ensuring the remaining volatile gases finish their combustion cycle. By modulating the fan speed via a built‑in variable‑frequency drive (VFD), operators can fine‑tune the air‑to‑fuel ratio in real time, reacting to load changes without interrupting the boiler’s duty cycle.
Technical Specifications
| Parameter | Typical Range | Units |
|---|---|---|
| Air Flow Rate | 15 000 – 45 000 | m³/h |
| Static Pressure | 200 – 800 | Pa |
| Power Consumption | 2 – 9 | kW |
| Operating Temperature | -20 – +120 | °C |
| Duty Cycle | Continuous (≥ 80 % load) | ‑ |
| Materials | Aluminium housing, stainless‑steel impeller | ‑ |
| Compliance | CE, ISO 9001, ASME Section III | ‑ |
Application Scenarios
- Municipal solid‑waste (MSW) incineration plants where a chain grate stoker supplies the primary fuel feed.
- Biomass‑fired power generation units that require precise air staging to meet emission limits.
- Cement kilns and lime production facilities using grate‑based combustion for alternative fuels.
- Industrial steam generators in petrochemical complexes where load variations demand rapid air‑flow adjustments.
Competitive Advantages
- High Efficiency: Optimised impeller geometry delivers up to 92 % aerodynamic efficiency, reducing auxiliary power draw.
- Robust Construction: Stainless‑steel impeller and powder‑coated aluminium housing withstand abrasive particles and corrosive flue gases.
- Flexible Integration: Standard 400 V 50/60 Hz electrical interface, optional VFD, and DIN‑rail mounting simplify retrofit projects.
- Low Maintenance: Brushless DC motor design eliminates frequent bearing replacement, extending service intervals beyond 20 000 h.
- Regulatory Ready: Certified to CE, ISO 9001 and ASME Section III, facilitating quick approval in global markets.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for a customised secondary‑air fan?
Our standard MOQ is 5 units for fully stocked models. For bespoke designs – such as special inlet dimensions or unique control interfaces – the MOQ can be reduced to a single prototype, with pricing adjusted accordingly.
Can the fan be adapted to different voltage and frequency standards?
Yes. We offer 380‑415 V three‑phase options for 50 Hz and 60 Hz markets, as well as 220‑240 V single‑phase variants for smaller installations. Custom voltage packs are available on request.
What is the typical lead time from order to delivery?
Standard stock items ship within 15‑25 days after order confirmation. Engineered‑to‑order units require 30‑45 days, depending on the complexity of the requested modifications.
What warranty and after‑sales support are provided?
All fans come with a 24‑month warranty covering material and workmanship. We also provide on‑site commissioning assistance, a dedicated technical hotline, and optional extended service contracts.
Ready to Upgrade Your Boiler’s Combustion Efficiency?
Contact our engineering sales team today to discuss the optimal configuration for your chain‑grate stoker boiler. Whether you need a ready‑stock solution or a fully customised secondary‑air fan, we deliver performance‑focused products that meet the strict demands of modern industrial combustion.
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