Dynamic Behavior of a Directly Combined Binary Turbine System with a Heat Recovery Water Circulation System

Abstract

The characteristics of a directly combined binary turbine system with two-stage heat recovering are investigated experimentally and theoretically from the view point of the network theory. This system consists mainly of a 40 KW-steam turbine, a 30KW-LBM turbine, an LBM vapor generator, a water-cooled steam condenser, an LBM condenser, and a 85KVA-AC generator. The waste heat from the steam turbine is recovered by the watercooled steam condenser at the first stage and the LBM turbine system at the second stage in this system. This system has two connections to combined two turbine systems ; a rotational shafting joining both turbines in mechanical parallel and an LBM vapor generator joining two turbines in thermal series. In the theoretical investigation, simple network models of the dynamic behavior of the system and the main components are derived. The models are inspected by the experiments of the step and frequency responses of the system. As a result, the dynamic behavior and the power generation mechanism of the system are clarified, relating with the operating points of the system.