Raadman Staging burners cover a firing range from 160 kW to 6200 kW in II or III stages Natural gas and light fuel oil. These industrial burners, with high-quality electro/mechanical accessories with easy installation, commissioning and menaissance, are economically designed for city or industrial applications such as three-pass hot water boilers, steam boilers, hot air generators etc.
Two or three-stage burners, following the temperature/steam load requested by the system, allow operating at full (or medium) and reduced output, with a consequent reduction in turning the burner on and off, which gives better performances to the boiler. Since the burner’s air damper is independently controlled by an electric servomotor, during stand-by, the air entrances are getting completely closed and prevent heat loss due to the flue’s natural draught.
One of the most highlighted privileges of the Raadman Staging Burner is the lack of a mechanical link between the gas butterfly valve and the air damper. In other words, the air damper is controlled with an independent two or three-stepping actuator. At the same time, gas (or light oil) is controlled with two or three parallel solenoid valves, resulting in the ability to precisely control and adjust each burner stage. This helps superior and complete combustion.

Fuel

• Natural gas
• Light oil (viscosity < 6 sCt)
• Other types of fuels (such as heavy oil, LPG etc.) requires written confirmation from the burner department of packman corporation (Raadman brand).

Applications

Raadman gas and dual fuel burners are suitable for the following utilization.

• Installation on heat exchanger
• Hot water boiler
• Steam boiler and high-pressure hot water boiler
• Hot air generator
• Compatible with all types of combustion chambers according to EN303 standards.

Standard Compliance

Designed in accordance with ISIRI-7595 and ISIRI-7594 Iran national standard (equal to the BS-EN676, and BS-EN267 European standards).

Technical & Functional Features

• Lightweight and optimized geometry.
• High-quality heat-resistant steel material for all parts of the burner head as well as flame covering accessories.
• Mono-bloc design and fully enclosed aluminium air housing.
• Simple Installation, adjustment and maintenance.
• Easy access to internal components.
• Engineered to maximize efficiency and fuel cost savings.
• Suitable for firetube, firebox and water tube boilers
• Equipped with high-quality and reliable electronic devices.
• Up to 10-20 % flame shape control
• High-quality staging controllers from well-known producers.

Control

The following methods of regulation are available for Raadman-Staging (Monoblock) burners:
Gas/oil: Two or Three stages of operation

Permissible ambient conditions

• Ambient temperature
• -10 to +40 °C (14 to 104F)
• -15 to +40 °C (5 to 104F)

Air humidity: max. 80 % relative humidity, no condensation.
The combustion air must be free of aggressive substances (halogens, chlorides, etc.) and impurities (dust, debris, vapours, etc.)

Emission

The emissions have been measured in various models at the maximum output, according to DIN-EN 676 and DIN-EN 297 standards.
The values of CO and NOx during burner operation are lower than 30 and 120 mg/kWh at 20 % excess of air for normal versions and, lower than 20 and 80 mg/kWh for Low NOx versions (LN series). consequently, the burner’s NOx class of II and III is reported and approved for normal version and LN Versions respectively.

Special Notes

LN versions have a higher rate of mixing during their operation. This results in a further decrease in the flame length and an increase in the flame diameter.

The flame dimensions which play an effective role in the burner efficiency and influence their compatibility with the boiler combustion chamber geometry, are presented in the above diagram.

Suggested combustion chamber dimensions

The Raadman burners can be appropriately selected for all boilers which are designed according to the BS-2790, BS-855, EN-303, and BS-EN 12953-3. It is recommended that a flame fill 90% of combustion chambers at its maximum output.