document

Hot air recirculation enlarges efficient operating window of reversible solid oxide cell systems: A thermodynamic study of energy storage using ammonia

Amladi, Amogh (author), Venkataraman, V. (author), Woudstra, T. (author), Aravind, P.V. (author)

Energy storage is vital for the energy transition, enabling reliable power grids based on intermittent renewables. Reversible solid oxide cell (rSOC) technology is promising for seasonal energy storage. The novel finding from this work is that optimised air recirculation for rSOC in endothermic electrolyser mode leads to efficiency being...

journal article 2024

document

Thermodynamic analysis of a novel integrated biomass pyrolysis-solid oxide fuel cells-combined heat and power system for co-generation of biochar and power

Kuo, P.C. (author), Illathu Kandy, B. (author), Özdemir, F. (author), Woudstra, T. (author), Aravind, P.V. (author)

Biochar derived from pyrolysis or gasification has been gaining significant attention in the recent years due to its potential wide applications for the development of negative emissions technologies. A new concept was developed for biochar and power co-generation system using a combination of biomass pyrolysis (BP) unit, solid oxide fuel cells ...

journal article 2022

document

Numerical Evaluation of Biochar Production Performance of Downdraft Gasifier by Thermodynamic Model

Shin, Donghoon (author), Francis, Akhil (author), Aravind, P.V. (author), Woudstra, T. (author), de Jong, W. (author), Roekaerts, D.J.E.M. (author)

A theoretical evaluation of the biochar production process using a biomass gasifier has been carried out herein. Being distinguished from the previous research trend examining the use of a biomass gasifier, which has been focused on energy efficiency, the present study tries to figure out the effect of biochar production rate on the overall...

journal article 2022

document

Negative Emission Power Plants: Thermodynamic Modeling and Evaluation of a Biomass-Based Integrated Gasification Solid Oxide Fuel Cell/Gas Turbine System for Power, Heat, and Biochar Co-Production—Part 1

Jaiganesh, N. (author), Kuo, P.C. (author), Woudstra, T. (author), Ajith Kumar, R. (author), Aravind, P.V. (author)

This article is the first of a two-part series presenting the thermodynamic evaluation and techno-economics of developing negative-emission power plants. The aim of this research is to evaluate the potential of biochar co-production in negative-emission power plants based on biomass-fed integrated gasification solid oxide fuel cell systems...

journal article 2022

document

Thermodynamic analysis of supercritical water gasification combined with a reversible solid oxide cell

Recalde Moreno Del Rocio, M.D.R. (author), Amladi, Amogh (author), Venkataraman, Vikrant (author), Woudstra, T. (author), Aravind, P.V. (author)

The low cost of electricity in some areas facilitates the adoption of high-temperature electrolysis plants for the large-scale storage of electricity. Supercritical water gasification (SCWG) is a promising method of syngas production from wet biomass. Additionally, it is a potential source of steam for electrochemical plants. However, the...

journal article 2022

document

Methanol based Solid Oxide Reversible energy storage system – Does it make sense thermodynamically?

Giannoulidis, S. (author), Venkataraman, V. (author), Woudstra, T. (author), Aravind, P.V. (author)

Hydrogen is yet to be widely accepted as a fuel for everyday operation due to stringent safety regulations involved around it. In the meanwhile, methanol could be a potential fuel of the future. In this work, an extensive thermodynamic investigation on an energy storage system with a reversible solid oxide stack at its core is presented. The...

journal article 2020

document

Gasifier, Solid Oxide Fuel Cell integrated systems for energy production from wet biomass

Recalde Moreno Del Rocio, M.D.R. (author), Woudstra, T. (author), Aravind, P.V. (author)

Nowadays, there is worldwide interest in diversifying energy supply. In this regard, biomass is the best possible renewable organic substitute for fossil fuels. In particular, the energy content of very wet biomass, recovered with appropriate technology, could potentially be used for power generation. In addition to power generation, this...

journal article 2019

document

Experimental model validation and thermodynamic assessment on high percentage (up to 70%) biomass co-gasification at the 253 MWe integrated gasification combined cycle power plant in Buggenum, The Netherlands

Thallam Thattai, A. (author), Oldenbroek, V.D.W.M. (author), Schoenmakers, L (author), Woudstra, T. (author), Aravind, P.V. (author)

journal article 2016

document

Thermodynamic System Studies for a Natural Gas Combined Cycle (NGCC) Plant with CO2 Capture and Hydrogen Storage with Metal Hydrides

Thallam Thattai, A. (author), Wittebrood, B.J. (author), Woudstra, T. (author), Geerlings, J.J.C. (author), Aravind, P.V. (author)

Flexibility in natural gas combined cycle power plants (NGCC) with pre-combustion CO2 capture could be introduced with co-production of hydrogen and subsequent hydrogen storage with metal hydrides (MH). The current work presents a thermodynamic analysis and comparison between steady state ASPEN Plus models of a reference case NGCC plant with no...

journal article 2014

document

The Influence of Ziegler-Natta and Metallocene Catalysts on Polyolefin Structure, Properties, and Processing Ability

Shamiri, A. (author), Chakrabarti, M.H. (author), Jahan, S. (author), Hussain, M.A. (author), Kaminsky, W. (author), Aravind, P.V. (author), Yehye, W.A. (author)

50 years ago, Karl Ziegler and Giulio Natta were awarded the Nobel Prize for their discovery of the catalytic polymerization of ethylene and propylene using titanium compounds and aluminum-alkyls as co-catalysts. Polyolefins have grown to become one of the biggest of all produced polymers. New metallocene/methylaluminoxane (MAO) catalysts open...

journal article 2014

document

Ceria Electrocatalysis Compared to Nickel Using Pattern Anodes

Patel, H.C. (author), Biradar, N. (author), Venkataraman, V. (author), Aravind, P.V. (author)

Ceria and nickel pattern anodes are prepared and tested in order to gain a fundamental insight into the electrochemical oxidation of hydrogen on either of these surfaces. It is found that ceria is highly active towards electrochemical oxidation of hydrogen with lower polarisation resistance because of the mixed ionic electronic conductivity of...

journal article 2014

document

Pattern Electrodes for Studying SOFC Electrochemistry

Patel, H.C. (author), Biradar, N. (author), Venkataraman, V. (author), Aravind, P.V. (author)

Pattern anodes can be used to localize reactions and study individual processes like charge transfer, adsorption, diffusion etc. Ceria and Nickel (Ni) pattern anodes were fabricated with the same dimensions with Triple phase boundary (TPB) lengths of 0.2707 m/cm2. Electrochemical Impedance Spectroscopy (EIS) of Ni anodes yielded results...

journal article 2013

document

Biomass Gasifier–SOFC Systems: From Electrode Studies to the Development of Integrated Systems and New Applications

Aravind, P.V. (author), Liu, M. (author), Fan, L. (author), Promes, E.J.O. (author), Giraldo, S.Y. (author), Woudstra, T. (author)

An overview of the research activities and on-going multiple projects at Delft University of Technology aimed at the development of Gasifier–Solid Oxide Fuel Cell (SOFC) based power plants are presented. Biosyngas generated in gasifiers consists of a mixture of carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), hydrogen (H2), nitrogen ...

journal article 2013

document

Kinetics of Internal Methane Steam Reforming in Solid Oxide Fuel Cells and Its Influence on Cell Performance– Coupling Experiments and Modeling

Fan, L. (author), Pourquie, M.J.B.M. (author), Thattai, A. (author), Verkooijen, A.H.M. (author), Aravind, P.V. (author)

Mathematical modeling tools are useful for predicting the safe operation limits and efficiencies of SOFCs. For a particular SOFC design, variations in internal methane reforming kinetic parameters is expected to affect local gas compositions, local Nernst voltages, current densities and temperature profiles and in turn the safe operation limits...

journal article 2013

document

Influence of Operation Conditions on Carbon Deposition in SOFCs Fuelled by Tar-Containing Biosyngas

Liu, M. (author), Millan-Agorio, M.G. (author), Aravind, P.V. (author), Brandon, N.P. (author)

This paper presents the influence of operation conditions including steam levels, current density and operating time on the performance of Solid Oxide Fuel Cells (SOFCs) fuelled by tar- containing biosyngas. The performance of SOFCs was evaluated by means of recording impedance spectra and polarization curves of the cells before and after tar...

journal article 2011

document

Influence of operation conditions on the carbon deposition of SOFC fuelled by gasified-syngas with tar included

Liu, M. (author), Millan, M.G. (author), Aravind, P.V. (author), Brandon, N. (author)

journal article 2011

document

Three-dimensional Modeling of Anode-supported Planar SOFC with Direct Internal Reforming

Qu, Z. (author), Aravind, P.V. (author), Ye, H. (author), Dekker, N.J.J. (author), Woudstra, N. (author), Verkooijen, A.H.M. (author)

This paper presents a three-dimensional model of an anode-supported planar SOFC with corrugated bipolar plates serving as gas channels and current collector above the active area of the cell, based on the direct internal reforming reaction of methane and the electrochemical reaction of hydrogen. A co-flow system with gas mixture of methane,...

journal article 2009

document

Publisher's Note: Diffusion Impedance on Nickel/Gadolinia-Doped Ceria Anodes for Solid Oxide Fuel Cells [J. Electrochem. Soc., 156, B1417 (2009)]

Aravind, P.V. (author), Ouweltjes, J.P. (author), Schoonman, J. (author)

journal article 2009

document

Diffusion Impedance on Nickel/Gadolinia-Doped Ceria Anodes for Solid Oxide Fuel Cells

Aravind, P.V. (author), Ouweltjes, J.P. (author), Schoonman, J. (author)

Electrochemical impedance measurements were carried out on symmetrical nickel/gadolinia-doped ceria test cells. For H2, N2, and H2O mixtures, the diffusion length obtained based on the impedance measurements is on the order of centimeters. This high value of the diffusion length is attributed to the flow field in the reactor. It is suggested...

journal article 2009

document

Three-dimensional Modeling of Anode-supported Planar SOFC with Direct Internal Reforming

Qu, Z. (author), Aravind, P.V. (author), Ye, H. (author), Dekker, N.J.J. (author), Woudstra, N. (author), Verkooijen, A.H.M. (author)

journal article 2009