Assessment of the Potential of Combined Micro Gas Turbine and High Temperature Fuel Cell Systems

Bohn, Dieter; Pöppe, Nathalie; Lepers, Joachim

doi:10.1115/gt2002-30112

Cited by 8 publications

(4 citation statements)

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“…In this configuration, the GT reaches an efficiency of 77.26%-LHV which is surprisingly high compared to typical GTs of that size which reach efficiencies of around 28%-LHV under ISO conditions. The reason for this exceptionally high GT efficiency is based on the fact that the definition of efficiency only accounts for the chemical energy in the fuel [50]. In a SOFC-GT hybrid, the GT fuel has a lower heating value of only 266 kJ/kg, and fuel and oxidant enter the combustor in a "pre-heated" state as they are the hot off-gases from the SOFC.…”

Section: Base Configuration Analysismentioning

confidence: 99%

Techno-Economic Analysis of Solid Oxide Fuel Cell-Gas Turbine Hybrid Systems for Stationary Power Applications Using Renewable Hydrogen

2023

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Solid oxide fuel cell (SOFC)–gas turbine (GT) hybrid systems can produce power at high electrical efficiencies while emitting virtually zero criteria pollutants (e.g., ozone, carbon monoxide, oxides of nitrogen and sulfur, and particulate matters). This study presents new insights into renewable hydrogen (RH2)-powered SOFC–GT hybrid systems with respect to their system configuration and techno-economic analysis motivated by the need for clean on-demand power. First, three system configurations are thermodynamically assessed: (I) a reference case with no SOFC off-gas recirculation, (II) a case with cathode off-gas recirculation, and (III) a case with anode off-gas recirculation. While these configurations have been studied in isolation, here we provide a detailed performance comparison. Moreover, a techno-economic analysis is conducted to study the economic competitiveness of RH2-fueled hybrid systems and the economies of scale by offering a comparison to natural gas (NG)-fueled systems. Results show that the case with anode off-gas recirculation, with 68.50%-lower heating value (LHV) at a 10 MW scale, has the highest efficiency among the studied scenarios. When moving from 10 MW to 50 MW, the efficiency increases to 70.22%-LHV. These high efficiency values make SOFC–GT hybrid systems highly attractive in the context of a circular economy as they outcompete most other power generation technologies. The cost-of-electricity (COE) is reduced by about 10% when moving from 10 MW to 50 MW, from USD 1976/kW to USD 1668/kW, respectively. Renewable H2 is expected to be economically competitive with NG by 2030, when the U.S. Department of Energy’s target of USD 1/kg RH2 is reached.

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Section: Base Configuration Analysismentioning

confidence: 99%

Techno-Economic Analysis of Solid Oxide Fuel Cell-Gas Turbine Hybrid Systems for Stationary Power Applications Using Renewable Hydrogen

2023

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“…Moreoyer, although the electric efficiency of SOFC is infiuenced by cell operating pressure, pressure is fixed at atmospheric pressure in the hybrid system here. While, the influence of the cell reaction temperature is assumed to be linear function [12].…”

Section: Fig5 Layout Of Sofc/apt Hybrid Systemmentioning

confidence: 99%

A205 Proposal of the Atmospheric Pressure Turbine (Apt) and High Temperature Fuel Cell Hybrid System

Tsujikawa

Kaneko

Suzuki

2003

ICOPE

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Solid oxide fuel cell (SOFC) has been extensively deyeloped in many countries as an ultra-high eencient energy converter, Such high temperature fuel cell can be operated as a hybrid system of integrating ef turbo machinery. A major decision is whether to place the cell stack in pressurized or unpressurized section, This paper discusses the exhaust energy recovery from fuel cells by use of turbo machines under unpressurized conditions, working with inverted Brayton cycle in which turbine expansion, cooling by heat exchanger and draft by compressor are made in an open cycle mode. It is denoted as "atmospheric pressure turbine (APT)",

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“…While these systems are currently under investigation at ondesign [3,6,10], off-design [11,12,13] and transient [2,14,15] conditions through different theoretical models, the experimental support is mandatory for the complete phenomenon understanding, the model validation, and the prototype development.…”

Section: Introductionmentioning

confidence: 99%

Emulation of Hybrid System Start-Up and Shutdown Phases With a Micro Gas Turbine Based Test Rig

Ferrari

Pascenti

Magistri

et al. 2008

Volume 2: Controls, Diagnostics and Instrumentation; Cycle Innovations; Electric Power

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The aim of this work, focused on natural gas fired distributed power systems, is the experimental analysis of the start-up and shutdown for high temperature fuel cell hybrid systems. These critical phases have been emulated using the micro gas turbine test rig developed by TPG at the University of Genoa, Italy. The rig is based on the coupling of a modified commercial 100 kWe recuperated gas turbine with a modular volume designed to emulate fuel cell stacks of different dimensions. It is essential to test the dynamic interaction between the machine and the fuel cell, and to develop different operative procedures and control systems without any risk to the expensive stack. This paper shows the preliminary experimental results obtained with the machine connected to the volume. The attention is mainly focused on avoiding surge and excessive stress on the machine components during the tests. Finally, after the presentation of the valve control system, this paper reports the emulation of the hybrid system start-up and shutdown phases. They have been performed to produce a gradual heating up and cooling down of the fuel cell volume, using the cold bypass line, three high temperature valves, and the machine load control system. This approach is necessary to avoid high thermal stress on the cell material, extremely dangerous for the plant life.

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Assessment of the Potential of Combined Micro Gas Turbine and High Temperature Fuel Cell Systems

Cited by 8 publications

References 0 publications

Techno-Economic Analysis of Solid Oxide Fuel Cell-Gas Turbine Hybrid Systems for Stationary Power Applications Using Renewable Hydrogen

Techno-Economic Analysis of Solid Oxide Fuel Cell-Gas Turbine Hybrid Systems for Stationary Power Applications Using Renewable Hydrogen

A205 Proposal of the Atmospheric Pressure Turbine (Apt) and High Temperature Fuel Cell Hybrid System

Emulation of Hybrid System Start-Up and Shutdown Phases With a Micro Gas Turbine Based Test Rig

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