Optimization and Parameter Influence of a Revised Graz Cycle With Pure Oxygen and Hydrogen Fuel
In order to improve the energy efficiency of hydrogen storage for power generation,in this work,based on the Graz cycle,an improved Graz cycle(R-Graz cycle)is proposed,which can realize more efficient hydrogen to electricity conversion.The modeling and optimization program of the cycle is developed based on MATLAB,and the thermodynamic properties of the working fluid are obtained by REFPROP.The results show that the R-Graz cycle can reach a net efficiency of 70.98%at the design point,which is about 0.5%higher than that of the Graz cycle with the same input parameters,and much higher than that of the modern gas-steam combined cycle.With the same amount of hydrogen used,the R-Graz cycle can produce 0.34%more electricity than the Graz cycle.Analysis on the influence of key parameters shows that increasing the inlet temperature and pressure of the high-temperature gas turbine and the inlet temperature of the high-pressure steam turbine as well as reducing the condenser pressure are conducive to improving the R-Graz cycle efficiency,among which the influence of the inlet pressure of the high-temperature gas turbine and condenser pressure is particularly significant.This research provides a new path for the application of electricity-hydrogen-electricity mode,and provides a reference for component design and parameter selection.
国家科技期刊平台
NSTL
万方数据
