Patent ID: 8475163
Filing Date: 2013-07-02
Classification: F23C,F23D,F24H

Abstract:
1. A heating device capable for heating by infrared radiation, comprising: at least one radiant tube having a first and an opposing second end, the radiant tube being capable to emit said infrared radiation; at least one fan provided for generating an excess or negative pressure inside the radiant tube; at least one burner connected with the first end of the radiant tube and being capable for combustion of a gaseous fuel, wherein the burner is connected directly to the fan in order to be supplied with fresh air, wherein the burner is capable of producing an elongated flame and exhaust gas only inside the radiant tube in order to heat the radiant tube, and wherein the burner is operable in at least two power stages; an exhaust gas passage being connected to the second end of the radiant tube opposite to the first end connected with the burner, the exhaust gas passage removing exhaust gas generated by the combustion of the fuel and the fresh air; and at least one exhaust gas recirculation system comprising: at least one exhaust gas recirculation passage which allows recirculating of at least a part of the exhaust gas to the burner; a control element for regulating, during operation of the radiant heater, the volume flow of the exhaust gas to be recirculated and the speed of the fan; wherein the control element controls the exhaust gas recirculation system and the speed of the fan in dependence on the power stages of the burner during operation of the radiant heater in such a way that the volume flow of the recirculated exhaust gas is reduced with an increasing power stage of the burner, and the speed of the fan is increased with an increasing power stage of the burner.