The circulating system composed of a gas turbine and a flue gas turbine further drives the flue gas turbine to generate electricity by utilizing the remaining pressure and enthalpy in the flue gas emitted by the gas turbine. Compared with the gas steam combined cycle system, this system does not require water at all, but the cost of the flue gas turbine is relatively high and has not yet been widely used.

A dual gas turbine generator set is composed of two parallel gas turbines as the power source. The two gas turbines are connected to the overrunning clutch parallel mechanism through two laminated couplings, and the overrunning clutch parallel mechanism is connected to the generator through a laminated coupling. The core components such as the laminated coupling and generator between the parallel mechanism and the generator are placed in a container with sound insulation devices, forming the main engine compartment, The main equipment and sound insulation box in the main engine compartment are installed on the overall chassis of the unit. This utility model achieves the goal of improving the power generation efficiency and saving fuel by using a type of gas turbine with a higher rated power generation gas turbine generator set and selecting a single or dual gas turbine according to the user's electricity consumption situation. It is suitable for large and medium-sized telecommunications bureaus, large enterprises, institutions, hotels, and other cities at all levels Hotels and key departments can be widely promoted and applied as backup emergency power sources during power outages.