Optimization Analysis of Natural Gas Burners and Fan Management in Tunnel Kiln Combustion
Based on Brictec Engineering Practices

1. Introduction
With the advancement of carbon neutrality goals and the green transformation of the brick industry, natural gas—being a clean and efficient fuel—is increasingly adopted in tunnel kiln systems. Brictec has successfully implemented natural gas combustion systems in multiple countries (such as Malaysia, Iraq, Uzbekistan), especially with its top-mounted integrated gas burners and frequency-controlled fan systems. This article summarizes the collaborative strategies of gas burners and fans based on real project experiences, providing practical, replicable technical guidance.

2. Overview of Brictec's Natural Gas Combustion System
(1) Burner Design Features: Brictec’s tunnel kiln gas burners adopt an integrated direct-injection design, installed at the roof of the firing and heating zones. The flame angle and length are adjustable, with 0–100% gas flow regulation. These burners ensure fast heating, high efficiency, and strong flame-to-product interaction.
(2) Integrated Control System: PLC + HMI touchscreen control system enables closed-loop temperature regulation, gas-air ratio control, alarm system, auto inspection, and remote DCS compatibility.
(3) Safety System: Equipped with double solenoid valves, flame detectors, flame arresters, overpressure protection, and CE/GB certifications.

3. Collaborative Management of Gas Combustion and Fan System
(1) Zonal Combustion Strategy: Each kiln zone (preheating, soaking, firing, cooling) is equipped with independent burners and temperature targets. In actual practice, the temperature deviation across the firing zone can be controlled within ±5°C.
(2) Air-Fuel Ratio Coordination: Air volume directly affects combustion efficiency. Brictec uses fan frequency conversion and proportional valve linkage to adjust air-fuel ratio dynamically at each stage:
● Ignition: Gas first, delayed air introduction;
● Heating: Air/fuel ratio ~1:1.05 for oxidizing atmosphere;
● Soaking: Reduce air slightly to save heat;
● Cooling: Shut fuel, low-speed air assists cooling.
(3) Integrated Optimization of Air Channels and Thermal Field: Fans should be designed in coordination with kiln sealing, brick stacking, and airflow channels. In wide-section kilns, combining lateral sealing air and undercarriage air ducts ensures thermal uniformity.
(4) Oxygen Control and Environmental Optimization: With online gas analyzers, the oxygen level is maintained at ~18%. Brictec’s system allows precise control of fan speed and burner output to ensure NOx emissions below 150 mg/Nm³, meeting China’s A-class standard.

4. Conclusion
Efficient coordination of natural gas burners and fan systems is key to achieving high-quality, low-emission, automated kiln operations. Brictec has developed a proven system across structure design, intelligent control, and environmental compliance—ready to scale in green brick plants worldwide.