The top lance ignition rod (also known as the RH top lance ignition rod) is a specialized ignition device for the furnace top of RH vacuum refining furnaces in the metallurgical industry, designed to safely ignite the top gas during wind shutdowns or maintenance operations, thereby preventing gas poisoning and explosions.

I. Core Structure

Body: double-layered sleeve;

 Inner pipe: for gas flow; Outer pipe: for oxygen or combustion air flow.

Gun tip: burner + semiconductor ignition nozzle (ignition end);

Transmission and Frame: Pneumatic actuators enable automatic advancement/retreat (initiates movement upon ignition, stops in high-temperature zones).

Explosion-proof high-energy igniter: converts 220 V to high voltage, uses capacitive energy storage (approximately 20 J), and generates high-frequency arc sparks;

Sealing and Cooling: Top furnace sealing assembly with air/water cooling system, resistant to high temperatures and leak-proof.

II. Working Principle

1. Positioning: The pneumatic device advances the nozzle to the ignition point at the furnace top;

2. Gas supply: Coal gas and oxygen-enriched air are introduced and mixed at the burner;

3. Ignition: The high-energy igniter discharges, generating an electric arc in the electrode to ignite the mixture;

4. Gun Retraction: After successful ignition, the gun body retracts outside the furnace to prevent damage from high temperatures.

The photo of the ignition rod with a gun barrel is shown below:

III. Key Parameters (Typical)

Propeller effective stroke: 400 mm;

Ignition energy: 20 J; Spark frequency: 10–15 times/s;

Ignition head: Made of 310S high-temperature resistant alloy, with a temperature resistance up to 1300°C, and excellent resistance to carbon buildup and ablation.

Conductive rod: 304 stainless steel, high strength and corrosion-resistant;

Internal insulation: High-frequency ceramic insulation, resistant to high-voltage leakage current and breakdown;

Standard diameter: Φ18 mm;

Connection thread: Commonly M18×1, length customizable as needed.

IV. Main Features

Safe and reliable: Automatic ignition and automatic discharge replace manual open flame operation, minimizing risks;

High-temperature resistant and long-lasting: The ceramic nozzle exhibits strong resistance to coking and self-cleaning properties, ensuring an extended service life.

Explosion-proof design: tightly sealed, suitable for flammable and explosive environments on furnace tops;

Easy maintenance: Modular design allows for online inspection and replacement.