Coal-fired thermal generator set thermal efficiency device and control method

The invention discloses a coal-fired thermal generator set thermal efficiency device and a control method. The coal-fired thermal generator set thermal efficiency device comprises a combustion hearth, a gas turbine and a gas compressor. The input end of the combustion hearth is connected with the gas compressor, and the output end is connected with the gas turbine through the punched plate set. The output end of the gas turbine is connected with the first input end of the waste heat boiler. The second input end of the waste heat boiler is connected with the output end of the water feeding pump; the output end of the waste heat boiler is connected with the input end of the steam turbine; the output end of the steam turbine is connected with the input end of the feed pump; the gas turbine and the steam turbine are both connected with the generator; a plurality of porous refractory bricks are attached to the inner wall of the combustion hearth. The technical problem that the overall combustion efficiency of an e