Firing equipment that can be operated under turbocharge

Firing equipment that can be operated under turbocharge for a steam generator, especially for fluidized bed firing, and that includes a turbocharged firing mechanism, comprising:

• at least two successively arranged air compressors that are rotatable independently of one another, including a first compressor, and a second compressor that communicates via a conduit means with said turbocharged firing mechanism;
• a first turbine that drives said first compressor, is disposed on a common shaft with said first compressor, and forms together with the latter a turbocharger, with the energy needed for driving said first compressor being extracted from flue gas of said turbocharged firing mechanism supplied via a conduit means to said first turbine:
• said first turbine has an outlet that communicates with a chimney;
• an air preheater that is disposed between said second compressor and said firing mechanism, with flue gas being supplied to said air preheater via a conduit means;
• a second turbine that drives said second compressor;
• at least during turbocharged operation of said firing mechanism, the flue gas is conveyed at high temperature first to said second turbine via a conduit means, and subsequently to said air preheater, which air preheater is disposed between said second compressor and said firing mechanism, said high temperature at which said second turbine receives said flue gas being close to the combustion chamber temperature of said firing mechanism;
• an electrical apparatus that is operable at least as a generator, and that is operatively associated with said second compressor and said second turbine;
• .said firing mechanism being intended for a steam generator that includes a water circulation system in which said firing mechanism is incorporated;
• a heat exchanger that is disposed between said air preheater and said first turbine and is associated with said water circulation system;
• and control means of controlling the heat transfer in said heat exchanger from said flue gas into said water circulation system.