Gas-burner device and method for operating a gas-burner device

Abstract

A gas-burner device and a method for operating a gas-burner device, includes a conveyor device for conveying a gaseous fuel to a burner and includes a recirculation device for recirculating an exhaust gas quantity produced during the combustion of the fuel to the burner. A sensor device ascertains the composition of the fuel, and the recirculation device is designed to be controlled on the basis of the fuel composition detected by the sensor device.

1 . A gas-burner device comprising a conveying apparatus ( 1 ) for conveying a gaseous fuel to a burner ( 2 ) and a recirculation apparatus ( 3 ) for returning to the burner ( 2 ) a quantity of exhaust gas produced during a combustion of the fuel,
 wherein   a sensor apparatus ( 4 ) is provided for ascertaining a composition of the fuel and the recirculation apparatus ( 3 ) is configured so as to be controlled as a function of the composition of the fuel detected by the sensor apparatus ( 4 ).   
     
     
         2 . The gas-burner device according to  claim 1 , wherein the sensor apparatus ( 4 ) is selectively configured as a gas chromatograph, as a gas thermal conductivity sensor, as an ionization sensor, as a UV sensor, as an oxygen sensor and/or as a temperature sensor. 
     
     
         3 . The gas-burner device according to  claim 1 , wherein the recirculation apparatus ( 3 ) comprises a recirculation valve ( 3 . 1 ). 
     
     
         4 . The gas-burner device according to  claim 1 , wherein, when viewed in the direction of flow of the fuel, a fuel-air mixing apparatus ( 5 ) is arranged upstream of the burner ( 2 ). 
     
     
         5 . The gas-burner device according to  claim 4 , wherein the fuel-air mixing apparatus ( 5 ) has, in addition to a fuel supply connection ( 5 . 1 ) and an air supply connection ( 5 . 2 ), an exhaust gas supply connection ( 5 . 3 ) which is connected to the recirculation apparatus ( 3 ). 
     
     
         6 . The gas-burner device according to  claim 1 , wherein the burner ( 2 ) is arranged in a combustion chamber ( 2 . 1 ) with an exhaust gas discharge connection ( 2 . 2 ) and the recirculation apparatus ( 3 ) has an exhaust gas connection ( 3 . 2 ) which is connected to the exhaust gas discharge connection ( 2 . 2 ). 
     
     
         7 . The gas-burner device according to  claim 1 , wherein the exhaust gas connection ( 3 . 2 ) of the recirculation apparatus ( 3 ) is configured so as to be connected to an exhaust gas supply connection ( 5 . 3 ) of a fuel-air mixing apparatus ( 5 ) via a connecting line ( 3 . 3 ). 
     
     
         8 . A method for operating a gas-burner device in which a gaseous fuel is conveyed by a conveying apparatus ( 1 ) to a burner ( 2 ) and a quantity of exhaust gas produced during a combustion of the fuel is returned to the burner ( 2 ) by a recirculation apparatus ( 3 ), wherein a composition of the fuel is ascertained by a sensor apparatus ( 4 ) and the recirculation apparatus ( 3 ) is controlled as a function of the composition of the fuel detected by the sensor apparatus ( 4 ). 
     
     
         9 . The method according to  claim 8 , wherein the conveying apparatus ( 1 ) and the recirculation apparatus ( 3 ) in each case are controlled individually as a function of the composition of the fuel. 
     
     
         10 . The method according to  claim 8 , wherein selectively hydrogen and/or natural gas are or is used as the gaseous fuel.