Power Generation with a Two-Phase Rotary Separator Turbine-Preliminary Consideration for Power Generation Using a Downhole Coaxial Heat Exchanger System (II)

Abstract

A downhole coaxial heat exchanger (DCHE) system as shown in Fig.l was proposed as a new geothermal energy extraction system. A series of studies (Morita and Sugimoto, 1988; Yamada et al., 1988; Fujita et al., 1988) were carried out on power generation using DCHE for the specified well design and temperature distribution in the underground formation. The purpose of these studies is to clarify at what thermal output or effective thermal conductivity of the formation the system becomes economical.

In this study, a set of reinjection temperature and flow rate whicn gives the maximum net power output was selected for each effective thermal conductivity. Then the optimum design conditions of each power plant were determined for selec ted four cases, and finally net power output was estimated. The comparison of two-phase turbine with the multi-flush system was also discussed.