Adapter fitting for use with a gas turbine and fluidized-bed furnace

In a stationary gas turbine installation including a compressor for generating process air, a turbine, a combustion chamber producing flue gas and having a connection flange, and an external pressure-supercharged fluidized-bed furnace producing flue gas, an adapter fitting comprising:

• a combined connection flange;
• a housing to be fitted between the combustion-chamber connection flange and said combined connection flange for the process air generated by the compressor and for the flue gas discharged toward the turbine;
• a first line connection at said housing to be fitted to said combined connection flange, said first line connection having an inlet for the process air generated by the compressor and an outlet for the flue gas;
• a second line connection at said housing to be fitted to said combustion-chamber connection flange, said second line connection having an inlet for the flue gas emanating from the combustion chamber and an outlet for the process air generated by the compressor;
• a third line connection having an inlet for the flue gas emanating from the fluidized-bed furnace;
• a fourth line connection having an outlet for discharging compressed process air to at least one of the fluidized-bed furnace and a coal gasification installation;
• said compressed process air outlets of said second and fourth line connections jointly communicating with said inlet of said first line connection;
• closure members for alternately opening and closing said compressed process air outlets of said second and fourth line connections;
• a flow passage disposed between said burner-side inlet of said second line connection for the flue gas and said outlet of said first line connection leading to the turbine;
• and
• at least one closure member to be opened and closed, said at least one closure member connecting said flow passage to said inlet of said third line connection for the flue gas emanating from the fluidized-bed furnace, for mixing the flue gas emanating from the fluidized-bed furnace with the combustion-chamber flue gas.