DEVICE AND METHOD FOR MONITORING THE AIR-FUEL RATIO IN STEAM GENERATORS

摘要

The invention relates to a device and a method for monitoring the air-fuel ratio in steam generators (15) with two or more burners (14a-14h) combined with an upstream gas turbine (5). The inventive device consists of at least one measuring apparatus (1) for the volume flow of incoming air (4) to the gas turbine (5), a measuring apparatus (18 or 19) for the volume flow of fuel (16 or 17) to the gas turbine (5), a measuring apparatus (10 or 11) for the volume flow of fuel (8 or 9) to the burners (14a-14h) of the steam generator (15), and a regulating mechanism (12 or 13) for the volume flow of fuel (8 or 9). Said regulating mechanism (12 or 13) is connected to the measuring apparatus (1, 18 or 19 and 10 or 11) by a control computer (2) so that the volume flow of fuel (8 or 9) can be controlled according to the mass flow of oxygen of the volume flow of waste gas (6).