Hybrid Cycles with Hydrogen as Fuel

The gas turbine and steam turbine combined cycle fueled with hydrogen have an overall high efficiency. The virtues of the supercritical steam turbine, the high temperature gas turbine and the low pressure steam turbine are fully expressed in this system. The mean temperature, at which the combined cycle absorb heat is upgraded greatly while the mean temperature, at which the cycle releases heat is decreased to environmental temperature, and finally the system efficiency is raised greatly to a high level. The simple combined cycle and the cycle with heat recover and reheat were analyzed and compared. The calculation results show that the overall efficiency of the once reheat system can reach 63.2% when the max pressure is at 30MPa and the max temperature is at 1500°C. And also, the combined cycle with hydrogen as fuel has no harmful emissions to the environment, it is a prospective energy conversion system in the near future.