Numerical study of heat transfer characteristics of semi-coke and steam in waste heat recovery steam generator for hydrogen production |
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| Affiliation: | 1. Laboratory of Energetic Mechanics and Engineering (LEMI), Faculty of Engineering, University of Boumerdes, Independence Avenue, Boumerdes, 35000, Algeria;2. Faculty of Mechanical and Process Engineering, University of Sciences and Technologies Houari Boumediene, BP 32 EL – Alia, Bab Ezzouar, 16111, Algiers, Algeria;1. Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA;2. Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran;3. Faculty of Chemical and Materials Engineering, Shahrood University of Technology, Shahrood, Iran;1. Department of Energy and Power Engineering, Shandong University, Jinan 250061, China;2. Inspur Group, Jinan, Shandong Province 250061, China;1. Center of Excellence in Design and Optimization of Energy Systems, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Fuel Cell Research Lab (FCReL), Mechatronic System Engineering, Simon Fraser University (SFU), Vancouver, Canada |
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| Abstract: | With the steam obtained from the waste heat of high temperature semi-coke, the hydrogen production through gasification method is considered more commercially. The heat transfer of semi-coke bed and steam was investigated using an unsteady convection heat transfer three-dimensional model of semi-coke. The effects of particle size, steam flow and particle bed thickness on heat transfer characteristics were considered. The particle temperature calculated by three-dimensional model was in good agreement with the corresponding particle temperature of experiment. The heat transfer characteristics of single particle, the particle temperature, the amount of heat recovery and the heat flux were investigated. The results show that, in the first 10 min of the heat transfer of semi-coke bed and steam, the bottom particle temperature decreases rapidly, but the top particle temperature is almost unchanged. The heat transfer rate evolution of the single particle in different positions is revealed. The heat transfer rate evolution of the bottom particle is different from that of the middle particle and top particle, and the heat transfer rate evolution of middle particle is similar to that of the top particle. The particle size, the steam flow and the particle bed thickness have great influence on the heat transfer mechanism of semi-coke and steam, and the 7.5 kg/h is considered to be the best steam flow for heat recovery. The intrinsic heat transfer mechanism between semi-coke bed and steam was revealed. |
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| Keywords: | Heat transfer Waste heat recovery Semi-coke Steam Hydrogen production |
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