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Title: Experimental and Theoretical Studies on Unmixed Combustion for Heat Transfer Applications
Researcher: Deshpande, Amol Anilrao
Guide(s): Krishnaswamy, Srinivas
Keywords: Chemical Engineering, Unmixed Combustion, Heat Transfer
University: Birla Institute of Technology and Science
Completed Date: 2016
Abstract: Unmixed Combustion (UMC), a novel variant of combustion, occurs when air and fuel alternately pass over an Oxygen Storage and Release Material (OSRM), mainly metal/metal oxides which undergo oxidation and reduction reactions. In this study, the potential of UMC is demonstrated for heat transfer applications. A purpose-built test rig, based on a dynamically operated Packed Bed Reactor (PBR) concept was designed, fabricated and commissioned. Experiments were conducted using a Cu based OSRM along with methane (CH4) and zero air (21 mol% O2) as reactive gases. The energy generated in both oxidation and reduction due to exothermicity was radially transferred by conduction and convection to coolant air. For a specific loading of 1.25 kg of OSRM and fixed reaction cycle times, the effect of varying zero air, coolant and CH4 flowrate and reactive gas inlet temperature on the radial heat transfer was investigated. The radial heat transfer rate was maximized at 95 ± 2 % of total energy in the bed at an inlet temperature of 873.15 K and zero air, coolant and CH4 flowrates of 15 LPM, 150 LPM and 2 LPM (corresponding to 10 mol % concentration) respectively. Under and#8213;cyclicand#8214; steady state conditions, the variation of bed temperature and coolant outlet temperature was restricted to within ± 30 K and ± 3 K respectively and the combustion process was observed to be self-sustaining. In addition a separate experimental investigation related to estimating kinetic parameters of oxidation of Cu and reduction of CuO, encountered in UMC, was carried out using a Pulsed Micro-reactor (PMR) technique. Plug flow condition in the reactor, essential for accurate estimation of kinetic parameters, was confirmed using a Residence Time Distribution (RTD) approach. A simple generic methodology, based on a uniform reaction model is presented and has been validated for both reactions which were found to be surface reaction controlled. The estimated values of reaction orders and activation energies for both reactions and the pre-exponential factor for
Pagination: 142p.
Appears in Departments:Chemical Engineering

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