Blast furnace gas residual pressure turbine system

The invention provides a blast furnace gas excess pressure turbine system which comprises a turbine, a gas inlet is formed in one side of the turbine, an exhaust port is formed in the other side of the turbine, the gas inlet of the turbine is connected with a gas inlet pipeline, the gas inlet pipeline is further connected with an outlet of a gas purification device, and the exhaust port of the turbine is connected with an exhaust pipeline. The gas pipeline is further connected with a gas pipe network, thermal expansion compensation and supporting of a gas turbine and a pipe system are carried out by reasonably arranging the type and the position of a gas pipeline support and optimizing the type of a compensator and combining the gas pipeline support with a specific elastic assembly, and long-term safe and stable operation of a unit and the pipe system is guaranteed. The defects that in the prior art, due to the fact that a support, a compensator and the like of a gas turbine pipeline are arranged unreasonably