Abstract
Infrared heaters based on radiant burners are widely used in industry for thermal processing of materials such as rolled steel, textiles, food and other products. A new configuration of a gas-fired infrared heater is proposed and has been experimentally studied. The heater is constructed using an annular cylindrical radiant burner mounted inside a stainless steel conical reflector. The combustion of premixed natural gas with air is stabilized in the cavity of the cylindrical burner which is made of porous Ni-Al intermetallic. The reflector not only refocuses the omnidirectional radiant flux of the burner, but also participates in heat exchange with flue gases and emits an additional IR flux. The radiant heat output and NOX emission of the IR-heater are experimentally studied in two combustion modes, i.e. operation with and without preliminary heating of combustion air by recuperating flue gas heat. The operating conditions providing a 70–75% radiation efficiency and NOX emission of about 75 ppm in the power range of 700–5700 W are discussed. For evaluating the potential application of a new IR-heater, the obtained results in terms of the relative NOX emission per unit of produced infrared heat are compared with those of typical radiant tubes and electric IR heaters.
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