Effect of the type of gasifying agent on gas composition in a bubbling fluidized bed reactor |
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| Affiliation: | 1. Department of Mechanical Engineering, West Virginia University Institute of Technology, 405 Fayette Pike, Montgomery, WV 25136-2436, USA;2. Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3, Canada;1. School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, PR China;2. School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;3. Shandong Baichuan Tongchuang Energy Company Ltd., Jinan 250101, PR China;1. Bioenergy 2020+ GmbH, Wiener Strasse 49, A-7540 Güssing, Austria;2. TU Wien, Institute of Chemical Engineering, Getreidemarkt 9/166, Vienna, Austria;1. School of Biosystems Engineering, University College Dublin, Belfield, Dublin 4, Ireland;2. Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX, USA;3. School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland;1. Universidad Pontificia Bolivariana, Facultad de Ingeniería Química, Grupo de Energía y Termodinámica, Circular 1ra #70-01, Medellín 56006, Colombia;2. Universidad Nacional de Colombia, Facultad de Minas, Grupo TAYEA, Carrera 80 No 65-223, Medellín 50041, Colombia;1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | It is commonly accepted that gasification of coal has a high potential for a more sustainable and clean way of coal utilization. In recent years, research and development in coal gasification areas are mainly focused on the synthetic raw gas production, raw gas cleaning and, utilization of synthesis gas for different areas such as electricity, liquid fuels and chemicals productions within the concept of poly-generation applications. The most important parameter in the design phase of the gasification process is the quality of the synthetic raw gas that depends on various parameters such as gasifier reactor itself, type of gasification agent and operational conditions. In this work, coal gasification has been investigated in a laboratory scale atmospheric pressure bubbling fluidized bed reactor, with a focus on the influence of the gasification agents on the gas composition in the synthesis raw gas. Several tests were performed at continuous coal feeding of several kg/h. Gas quality (contents in H2, CO, CO2, CH4, O2) was analyzed by using online gas analyzer through experiments. Coal was crushed to a size below 1 mm. It was found that the gas produced through experiments had a maximum energy content of 5.28 MJ/Nm3 at a bed temperature of approximately 800 °C, with the equivalence ratio at 0.23 based on air as a gasification agent for the coal feedstock. Furthermore, with the addition of steam, the yield of hydrogen increases in the synthesis gas with respect to the water–gas shift reaction. It was also found that the gas produced through experiments had a maximum energy content of 9.21 MJ/Nm3 at a bed temperature range of approximately 800–950 °C, with the equivalence ratio at 0.21 based on steam and oxygen mixtures as gasification agents for the coal feedstock. The influence of gasification agents, operational conditions of gasifier, etc. on the quality of synthetic raw gas, gas production efficiency of gasifier and coal conversion ratio are discussed in details. |
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| Keywords: | Coal gasification Bubbling fluidized bed Synthesis raw gas Steam Equivalence ratio |
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