Gas turbine staged combustion device coupled with ammonia fuel pre-cracking

The invention discloses a gas turbine staged combustion device coupled with ammonia fuel pre-cracking. The gas turbine staged combustion device comprises a combustion pipe, a fuel channel outer pipe and an air channel outer pipe which are coaxially and fixedly arranged from inside to outside. An air inlet hole plate is arranged at the front end of the combustion pipe, an axial air inlet through hole is formed in the air inlet hole plate, a smoke outlet is formed in the rear end of the combustion pipe, a first-stage porous medium and a second-stage porous medium are arranged in the multi-stage combustion cavity at intervals, and a fuel injection hole penetrating through the pipe wall of the combustion pipe is formed in the position, corresponding to the second-stage porous medium, of the combustion pipe; an air input through hole is formed in the front end of the fuel channel outer pipe, and an ammonia fuel inlet communicated with the annular fuel channel is formed in the rear end of the fuel channel outer pip