Development of a novel regenerable zinc ferrite sorbent for hot gas desulfurization

Integrated Gasification Combined Cycle System (IGCC) promises efficient, clean and economical electrical power generation. In this system coal is gasified under high temperature and pressure. The coal gas exiting the gasifier is cleaned from the particulates and sulfurous compounds with a `Hot Gas Cleanup` system in which metal oxide sorbents are used to remove H{sub 2}S. The cleaned gas is then used to run the gas turbines and the recovered heat is used to run the steam turbines to generate electricity with overall energy conversion efficiency reaching up to 50 %. The H{sub 2}S produced in the reducing atmosphere of the gasifier must be removed from the coal gas since the tolerable limit of the system for H{sub 2}S is about 150 ppm and it causes environmental pollution. Various studies showed that zinc ferrite is a favorable sorbent for hot gas desulfurization with its high H{sub 2}S absorption capacity and easy regenerability. Although this is the case, the present zinc ferrite formulations do not have sufficient structural stability to withstand a fluidized-bed environment. In this study, it was aimed to increase the structural stability of the zinc ferrite by supporting it with a zeolite. Supported zinc oxide and iron oxide sorbents were also tested for comparison.


Development of different carbon supports for proton exchange membrane fuel cell electrocatalysts
Güvenatam, Burcu; Eroğlu, İnci; Bayrakçeken, Ayşe; Department of Chemical Engineering (2010)
Proton exchange membrane (PEM) fuel cell technology is promissing alternative solution to today’s energy concerns providing clean environment and efficient system. Decreasing platinum (Pt) content of fuel cell is one of the main goals to reduce high costs of fuel cell technology in the way of commercialization. In this target, porous carbons provide an alternative solution as a support material for fuel cell electrocatalysts. It is also essential to increase surface area of carbon support material to have w...
Design and realization of a new concentrating photovoltaic solar energy module based on lossless horizontally staggered light guide
Selimoğlu, Özgür; Turan, Raşit; Department of Physics (2013)
Concentrating Photovoltaic systems are good candidates for low cost and clean electricity generation from solar energy. CPV means replacing much of the expensive semiconductor photovoltaic cells with the cheaper optics. Although the idea is simple, CPV systems have several problems inherent to their system design, such as module thickness, expensive PV cells and overheating. Light guide systems are good alternatives to classical CPV systems that can clear off most of the problems of those systems. In this t...
Design of a Power Plant Emulator for the Dynamic Frequency Stability Studies
Duymaz, Erencan; Pourkeivannour, Siamak; Ceylan, Doğa; ŞAHİN, İLKER; Keysan, Ozan (2018-10-25)
Increasing renewable energy integration to grid requires inertial support to improve frequency stability of the power system. Inertial support of renewable energy systems requires hardware verification in order to test practical limitations and absence of dynamical grid simulators makes verification studies more challenging. In this study, a test rig which is composed of a DC motor, an AC synchronous generator and an external flywheel, is developed in order to provide a platform in which dynamic properties ...
Investigation of temperature profile in high temperature PEM fuel cell
Çağlayan, Dilara Gülçin; Eroğlu, İnci; Devrim, Yılser; Department of Chemical Engineering (2016)
High temperature polymer electrolyte membrane fuel cells (HT-PEMFC) are promising alternative energy sources for the future. As an advantageous tool in the design of a system, modeling requires less time compared to the experiments as well as its low cost. This study includes both isothermal and non-isothermal three-dimensional mathematical models for a HT-PEMFC having an active area of 25 cm2. Governing equations are solved by using Comsol Multiphysics 5.0 “Batteries & Fuel Cells” module, which is a commer...
Development of 500 W PEM fuel cell stack for portable power generators
DEVRİM, YILSER; Devrim, Huseyin; Eroğlu, İnci (2015-06-29)
Polymer Electrolyte Membrane Fuel Cell (PEMFC) portable power generators are gaining importance in emergency applications. In this study, an air-cooled PEMFC stack was designed and fabricated for net 500 W power output. Gas Diffusion Electrodes (GDE's) were manufactured by ultrasonic spray coating technique. Stack design was based on electrochemical data obtained at 0.60 V was 0.5 A/cm(2) from performance tests of a single cell having the same membrane electrode assemblies (MEA) that had an active area of 1...
Citation Formats
A. Aksoy, “Development of a novel regenerable zinc ferrite sorbent for hot gas desulfurization,” Espoo, Finlandiya, 1995, vol. 1, Accessed: 00, 2021. [Online]. Available: