PLANT PERFORMANCE AND ECONOMIC STUDY ON OXY-FUEL GAS TURBINE POWER PLANT UTILIZING NUCLEAR STEAM GENERATOR

In this paper we propose a new plant of a closed cycle oxy-fuel gas turbine power plant combining a nuclear heat generator. A pressurized water reactor (PWR) is designed to supply saturated steam into an oxy-fuel gas turbine power plant for specific power output increase. The saturated steam from the reactor can be under lower pressure and temperature than those of an existing PWR power plant. In this study we estimated plant performance from the heat balance model based on a conceptual design of a hybrid plant and generating costs of the proposed plant calculated from Japanese cost data of an existing PWR plant and an LNG combined cycle gas turbine plant. The generating efficiency of an oxy-fuel gas turbine plant without nuclear steam generator is estimated to be less than 35 [%]. Based on this efficiency of the whole plant performance, the corresponding generating efficiency of nuclear steam generator contributing to the specific power output of the proposed hybrid plant is estimated to be around 45 [%] even if the steam conditions are lower than an existing PWR plant. The generating costs of the hybrid plant are estimated for some different power capacities from 200 to 1000 [MWe] with gas turbine combustor inlet pressure of 5.00 [MPa]. The generating costs are 15-20 [%] lower than those calculated from the weighted heat performance of both an oxy-fuel gas turbine plant without nuclear steam generator and an existing PWR plant.