FRG Series Gas Burners Bulletin 1.1 January 2011
Fives North American Combustion UK, Ltd.
from a standard or low velocity of approximately 30 m/s to a high velocity of 145 m/s. It should be noted that the high velocity of 145 m/s is achieved at the maximum capacity which requires higher air/gas provisions. At the nominal capacity the exhaust velocity achieved is approximately 100 m/s. In addition, a wide range of air/fuel ratios can be accommodated from excess air levels, to give a diluted exhaust temperature for gentle drying applications, through to excess fuel operation for reducing atmosphere work. They are thus suited to a wide range of industrial processes with temperatures up to 1600°C. An orifice plate is incorporated in the air inlet flange thus enabling an accurate measure of air flows to be obtained. It should be noted that in general if the orifice plate is removed, for example to reduce the air pressure required at the burner, then the gas pressure may exceed the air pressure. Therefore if a proportionator is used to control the air/fuel ratio it must be a multiplying proportionator – refer to Fives for further information if required. By design, high on ratio turndown is achieved. The burner can operate with preheated air up to 350°C. Burner options available All burners are supplied with direct spark ignition and flame rod. UV flame detection can be supplied as an option – reference should be made to Fives. Similarly special arrangements such as cranked flame tube outlets can be supplied. Again reference should be made to Fives. FRG – Features High on-stoichiometric turn-down High velocity up to 145 m/s Preheated air up to 350°C standard (higher temperatures available – contact Fives) Choice of alloy or silicon carbide flame tube or refractory tile Various ignition and flame monitoring options
The FRG range of burners offers a wide choice of options for operation up to 1600°C. At temperatures up to 1000°C, an alloy flame tube is available. Above this temperature the ‘S’ version is equipped with a silicon carbide flame tube for low, medium or high velocity. For temperatures above 1600°C please consult Fives. The FRG burner with its alloy or silicon carbide flame tube is a highly versatile burner with the flame tube length variable to suit the application. Lengths from 120mm upwards are possible with the alloy flame tube and from 200mm for the silicon carbide unit. Additionally the silicon carbide flame tube can be mounted to an alloy tube of variable length to enhance the flexibility of the FRG burner. The medium velocity version, the FRG MVS, produces a stream of combustion products to promote rapid stirring within the furnace. This increases the heat transfer to a cold load by the reduction in thermal boundary layer thickness and at temperature further aids heat transfer by maintaining a homogeneous gas temperature throughout the furnace. All burners in the range have spark ignition with ionisation flame monitoring. UV scanning may be employed under certain circumstances. Reference should be made to Fives. Burner design / principles of operation The FRG range of burners is a series of nozzle mixing burners producing burner exhaust velocities
Fives North American Combustion UK, Ltd. Heath Mill Road, Wolverhampton WV5 8BD England Tel +44 (0) 1902 891200 Fax +44 (0) 1902 895552 email: fna.salesUK@fivesgroup.com www.fivesgroup.com
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