Tobias Panne

Micro Gas Turbine Test Rig for Hybrid Power Plant Application

Within the scope of a hybrid power plant project a micro gas turbine test rig was developed and is actually under construction at the DLR Institute of Combustion Technology. The test rig consists of a Turbec T100PH micro gas turbine and the required piping system for the hybrid application. Instead of a real solid oxide fuel cell (SOFC) stack a fuel cell simulator is used to avoid any risks for the sensitive and expensive real device. This simulator is able to emulate the SOFC interface conditions. The present paper reports the underlying pressurized hybrid power plant cycle, the setup of the test rig and the selection of the subsystems. Initially the micro gas turbine, equipped with a detailed instrumentation, was analyzed separately. First experimental data obtained with the micro gas turbine are presented.Copyright

Thermodynamic Process Analyses of SOFC/GT Hybrid Cycles

This paper presents the description of a numerical design tool for the steady state thermodynamic process analysis of SOFC/GT hybrid systems. The tool includes models for all gas turbine components and for a SOFC stack, based on the tubular fuel cell design of Siemens. The modular structure of the code allows the simulation of all kinds of hybrid system configurations with gas turbines from different manufacturers and of varying performance ranges. Furthermore a selection of atmospheric and pressurized hybrid systems based on the Turbec T100 micro gas turbine and a tubular SOFC stack is discussed. Also parameter studies are shown which focus on the operating conditions of the chosen system configurations.

Steady State Analysis of a SOFC/GT Hybrid Power Plant Test Rig

In the present paper a steady state analysis of a SOFC/GT hybrid cycle test rig is shown. In the test rig the SOFC stack is replaced by a hardware simulator. Therefore the cycle can be investigated without the risk of damaging the cell. One focus of the numerical studies presented here is the influence of the SOFC stack size on the commercial Turbec T100 gas turbine and the system parameters, i.e., power output and electrical efficiency. The results are used to define the stack size for the test rig simulator. Based on the test rig configuration another focus of this paper is to work out the effect of several system parameters, like ambient conditions or pressure losses, on the hybrid system. Here the discussion will concentrate on the gas turbine operating behavior. Furthermore the power balance between fuel cell and gas turbine. Therefore the SOFC boundary conditions are changed to analyze there influence on the system performance. For the presented studies a validated steady state in-house simulation tool is used.Copyright

Comparison of Combustion Models and Reaction Mechanisms for FLOX® Combustion

Flameless combustion is characterized by very low NOx and CO emissions. It has successfully been used in technical furnaces under atmospheric conditions for many years. For the use in modern gas turbines the combustors have to be redesigned to meet the typical operating condition, i.e. high pressure and temperature. The flameless combustion under gas turbine relevant conditions has successfully been simulated using a detailed chemistry model [1]. However computational costs and turnaround times are very high for these simulations. In this work the influence of different reduced reaction mechanisms on the heat release and on the temperature and flow field depending on the implied combustion model are investigated. As a benchmark the simulations are compared to experimental data obtained by OH* chemiluminescence and OH LIF measurements [2]. The simulations are performed on the basis of the commercial software package ANSYS CFX 11.0.Copyright