Combustion controller

A combustion controller for controlling fuel and air which are supplied into a combustion furnace for burning a substance, the combustion controller comprising:

• a fuel supply unit for supplying fuel and air into the combustion furnace;
• an air supply unit which is disposed downstream of the fuel supply unit in a direction of flow of combustion air and supply air into the combustion furnace;
• a concentration measuring unit for measuring a concentration of hydrogen sulfide of the combustion air by passing a measurement beam of light through the combustion air at a measurement position downstream of the fuel supply unit in the direction of flow of the combustion air;
• and
• a control unit for controlling an amount of air to supply from the fuel supply unit based on a measurement result provided by the concentration measuring unit, wherein
• the measurement beam of light is a laser beam in a wavelength band that is absorbed by the hydrogen sulfide, and
• the concentration measuring unit includes:
• a light-emitting element for emitting a laser beam,
• a light-receiving element for receiving a laser beam having emitted from the light-emitting element and having passed through the combustion air, and
• a computing unit for computing the concentration of hydrogen sulfide based on the beam of light emitted from the light-emitting element and the beam of light received by the light-receiving element.