ENERGY STORAGE: LIQUID CH4 AND CO2 NETWORK INTEGRATION

In this project, we will study the energy storage with liquid methane linked to a CO2 network that provides heat for district heating. The generated methane enters an hybrid cycle composed of a solid oxide fuel cell and turbines to generate electricity. The goal of this project is to determine the global eciency of the system but also to optimize it with the help of softwares like Belsim Vali and Osmose. In addition, we determine its cost. At the end, we compare the global system with an equivalent one without the CO2 network integration.

Optimal Process Design for Power Production from Wet Waste Biomass by Hydrothermal Gasification coupled to a Solid Oxide Fuel Cell

This report presents a system analysis of the production of electricity from wet waste biomass. A system of Hydrothermal Gasification is coupled with a Hybrid Cycle composed by a SOFC and two Gas Turbines, driven in an inverted Brayton--‐Joule cycle. A thermodynamic optimization approach, based on the system energy integration, is used to analyze several configuration options. The influence of the process design on performances is discussed for the most representative scenario that highlights the key aspects of the system. Optimization results prove that a systematic system design may reaches efficiencies higher than 60%.

2011

Thermo-economic Optimization of a Solid Oxide Fuel Cell, Gas Turbine Hybrid System

Nordahl Autissier, Daniel Favrat, François Maréchal, Francesca Palazzi, Jan Van Herle

Large scale power production benefits from the high efficiency of gas-steam combined cycles. In the lower power range, fuel cells are a good candidate to combine with gas turbines. Such systems can achieve efficiencies exceeding 60%. High temperature Solid Oxide Fuel Cells (SOFC) offer good opportunities for this coupling. In this paper, a systematic method to select a design according to user specifications is presented. The most attractive configurations of this technology coupling are identified using a thermo-economic multi-objective optimization approach. The SOFC model includes detailed computation of losses of the electrodes and thermal management. The system is integrated using pinch based methods. A thermo- economic approach is then used to compute the integrated system performances, size and cost. This allows to perform the optimization of the system with regard to two objectives: minimize the specific cost and maximize the efficiency. Optimization results prove the existence of designs with costs from 2400

/kW for a 44% efficiency to 6700

/kW for a 70% efficiency. Several design options are analysed regarding, among others, fuel processing, pressure ratio or turbine inlet temperature. The model of a pressurized SOFC-microGT hybrid cycle combines a state-of- the-art planar SOFC with a high speed micro gas turbine sustained by air bearings.

2007

Electric vehicle charging station using fuel cell technology: Two different scenarios and thermodynamic analysis

Martin Daniel Gay, Hossein Pourrahmani, Jan Van Herle

This study evaluates two different scenarios of an integrated system to generate electricity for a charging station using proton exchange membrane fuel cell (PEMFC) and solid oxide fuel cell (SOFC). To improve the efficiency, the exhaust heat of these two fuel cells are recovered by two different bottoming power cycles of Kalina Cycle (KC) and Organic Rankine Cycle (ORC). The system is designed for a 100 kW charging station capable to charge five cars simultaneously, assuming a standard car used in daily life with a battery capacity of 36 kWh and a range of 220 km. Thermodynamic analysis of the system is performed in different current densities from 0.5 A/cm(2) to 0.8 A/cm(2). In the first scenario, results indicated that the overall energy efficiency of the system is 58.47% at 0.5 A/cm(2) and 49% at 0.8 A/cm(2), while that of the second scenario is 43.21% at 0.5 A/cm(2) and 35% at 0.8 A/cm(2). To improve the dynamic response of the system, a high capacity battery and a supercapacitor were integrated to the fuel cell system. It was found that a hybrid combination of the battery and supercapacitor improve the performance of the system. (C) 2021 The Author(s). Published by Elsevier Ltd.

ELSEVIER2021

Thermo-economic Optimization of a Solid Oxide Fuel Cell, Gas Turbine Hybrid System

Nordahl Autissier, Daniel Favrat, François Maréchal, Francesca Palazzi, Jan Van Herle

/kW for a 44% efficiency to 6700

2007