Combustion control in domestic gas appliances

Fuel gases containing hydrogen

Several European manufacturers are today offering domestic gas boilers that are able to burn gases of different composition with automatic adjustment of the excess air ratio. This study was initiated by test results from E.ON in Germany, which showed that the automatic adjustment did not operat as planned when hydrogen was added to natural gas.

The report contains a description of the combustion control systems used in some European residential condensing gas boilers with fully premixed burners. Combustion control systems are based either on flame ionisation or flue gas analysis to evaluate the combustion.