水素燃焼タービン発電システムの起動解析

Abstract

The new thermodynamic cycle using hydrogen energy is now under investigation by many engineers. The Japanese World Energy Network research program is also hydrogen technology development program. One of the target of the program is to develop the high thermal efficiency power plant without emissions. The H2-O2 fired gas turbine is the key technology of the project and the new RANKINE cycle is suggested as one of the most effective cycle. The new RANKINE cycle is based on the direct steam expansion cycle and the performance calculation has been examined to find the optimal operating point. For the cycle development, further investigations of the component development, the operational ability, and the cost competitiveness are important. Among these investigations, this paper reports the operational ability, especially the start up performance. In this analysis, the algorithm and flow line for start up is developed. And the investigation finds that the new RANKINE cycle has the good possibility for the practical use. NOMENCLATURE A heat transfer area Cp specific heat under constant pressure D diameter F mol flow per second G weight H enthalpy per unit mass HHV higher heating value per unit mass I momentum of inertia K coefficient of heat transfer M heat capacity N revolution per minute Q heat transfer quantity T torque W mass flow per second dTm logarithmic mean temperature difference efb combustion efficiency eff isentropic efficiency g gravitation mtl metal section ω rotational speed per second subscripts b combustion c cold side d driving g gas h hot side I inlet l load o outlet sat saturated steam stm superheated steam tb turbine w water superscript th theoretical INTRODUCTION Hydrogen energy is the clean energy if it is produced by the renewable water electrolysis energy or solar energy. It can also contribute to an emission free thermal cycle if it is combusted with pure oxygen. In this point of view, H2-O2 fired gas turbine combined cycle is paid much attention ( Jericha et al., 1991) . In Japan, the cycle is also investigating in World Energy Network (WE-NET) research program proposed by Japanese government. In the program, the hydrogen production