422 An improvement on thermal efficiency of the CO_2 hydrate power generator : An investigation into re-use of reaction heat by hydration and dissociation, and cold-heat recovery in the turbine

Abstract

Gas hydrate is a compound that consists of guest molecules and water molecules, is formed by pressuring and cooling to become a condition of certain pressure and temperature. When the gas hydrate formed into a gas-tight container is heated, the dissociation of the gas hydrate increases pressure in the container. The magnitude of this pressure increase is comparable to that of the cylinder pressure of an internal combustion engine. In this paper, it is considered that two approaches for improving the thermal efficiency of the power generator. The first approach is is to be reused with each reaction heat of formation and dissociation. And second approach is to use recovery heat that occurs when the working gas expands in the turbine for formation of hydrate. Numerical analysis was carried out to investigate of above approaches using Englezos-Bishnoi model.