Fuel Nozzle

The fuel nozzle is a critical component within burner assemblies that precisely controls the flow, atomization, and direction of liquid or gaseous fuel into the combustion zone. It ensures optimal fuel-air mixing for efficient combustion, stable flame formation, and controlled heat release in industrial heating systems, boilers, furnaces, and engines. The nozzle is designed to operate under specific conditions, with a flow rate range of 0.5–2.0 L/min, a spray angle of 30–90°, and a droplet size (SMD) of 20–100 µm. Operating pressure is typically 1.0–1.6 MPa, and the maximum temperature is 300°C. The material grade is 316L stainless steel, with a tolerance of ±0.05 mm and a surface roughness of Ra 0.8. Connection size is 1/4–1/2 inch NPT, and weight ranges from 0.2–0.5 kg. These parameters are reference ranges that must be verified for the specific model and application. The nozzle is manufactured from stainless steel, high-temperature alloys, or ceramic, depending on the application requirements. It is essential to confirm model-specific values and standards with the legal manufacturer or supplier before procurement. The nozzle's performance directly impacts combustion efficiency, emissions, and system reliability. Proper selection requires consideration of fuel type, burner capacity, and environmental conditions. Regular inspection and maintenance are necessary to ensure optimal performance and prevent issues such as clogging or wear. Failure to operate within specified limits can lead to incomplete combustion, increased emissions, or equipment damage. Always consult the manufacturer's documentation for detailed specifications and installation guidelines.

Fuel under pressure is forced through small orifices in the nozzle tip, creating high-velocity streams that break the fuel into fine droplets (atomization). The nozzle's internal geometry (swirl chambers, vanes) imparts rotational motion to the fuel, forming a conical spray pattern that promotes rapid mixing with combustion air for complete burning. The operating pressure range of 1.0–1.6 MPa ensures adequate atomization. The spray angle and droplet size are influenced by the nozzle design and operating conditions. Proper atomization is critical for efficient combustion and stable flame formation.