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Japan Atomic Energy Research Institute (JAERI) has been proceeding a feasibility study of a direct gas turbine system (HTGR-GT) for 600MWt grade high temperature gas cooled reactors. This study will be contributed to design a high performance HTGR-GT system of 50% high thermal efficiency. In this study, very high performance design consisting of high recuperator effectiveness, low pressure drop, compactness, high thermal density and high differential pressure is required to the recuperator. A conceptual design study of ultra-fine offset fin type compact heat exchanger (height/pitch=1.0/1.0-1.5/1.5mm, fin thickness=0.1-0.15mm) was performed, considering not only flow pass and structural features, but material structural strength. The design study resulted in the high performance recuperator of 95% heat efficiency, low pressure drop (≤2%), 20MW/mm2 thermal density with 1, 500mm2/m3 surface compactness and high pressure tightness under 6MPa operation pressure. Research and developments for this type of recuperator are summarized for its practical use. The purpose of this study is to clarify the basic design concept and the performance of the compact heat exchanger for the HTGR-GT systems.

Feasibility Design Study of Compact Heat Exchanger for HTGR Gas Turbine Systems.