The pulverized coal burner is the heart of a cement rotary kiln's firing system, injecting a controlled mixture of coal dust and primary air into the kiln for combustion. LIMING's multi-channel burners deliver superior combustion efficiency, precise flame shape control, and reduced NOx emissions for modern cement production lines.
A pulverized coal burner is the critical combustion device installed at the kiln hood outlet of a rotary kiln. Its primary function is to efficiently mix finely ground coal (pulverized coal) with combustion air and inject this mixture into the kiln, where it ignites and burns to generate the high temperatures (1400-1450°C) required for clinker formation.
LIMING's multi-channel coal burners represent the latest advancement in kiln burner technology. Unlike traditional single-channel burners that mix coal and air in a simple tube, multi-channel burners use concentric annular channels to separately control axial air, swirl air, coal flow, and central air. This design allows independent adjustment of flame shape, length, and intensity — critical parameters that determine clinker quality, refractory life, and fuel consumption.
| Type | Channels | Flame Shape | Best For |
|---|---|---|---|
| 3-Channel Burner | Axial air, swirl air, coal + primary air | Moderately adjustable | Standard cement kilns, single fuel |
| 4-Channel Burner | Axial air, swirl air, coal, central air | Highly adjustable | Large kilns, multi-fuel, low NOx |
| Duct Burner | Simple single or dual channel | Limited adjustment | Small kilns, retrofit |
The burner nozzle tip operates in the hottest zone of the kiln and must withstand direct flame radiation and temperatures exceeding 1400°C. LIMING uses the following materials for the burner tip and wear parts:
Combustion expertise backed by decades of kiln system engineering for cement plants worldwide.
Our engineers perform CFD modeling and on-site commissioning to tune burner parameters for your specific coal and kiln.
Staged air injection and optimized mixing reduce NOx formation without requiring expensive post-combustion treatment.
Burner tips manufactured from heat-resistant alloys with optional ceramic protection for extended service intervals.
On-site burner tuning by LIMING combustion specialists ensures optimal flame geometry and fuel efficiency.
| Parameter | 3-Channel Burner | 4-Channel Burner |
|---|---|---|
| Kiln Capacity | 300-5,000 t/d | 2,000-12,000 t/d |
| Channels | Axial air, swirl air, coal flow | Axial, swirl, coal, central air |
| Primary Air Ratio | 8-12% | 6-10% |
| Coal Fineness | R80µm ≤ 12% | R80µm ≤ 10% |
| Flame Shape Adjustment | Moderate | Wide range |
| NOx Reduction | Baseline | Up to 30% lower |
| Alternative Fuel Capability | Limited | Up to 30% TSR |
| Burner Tip Material | Cr25Ni20 heat-resistant steel | Cr25Ni20 + ceramic coating |
| Lead Time | 45-60 days | 60-90 days |