Investigation into the flow behavior of high-temperature ash and low-temperature ash of high calcium coal |
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| Affiliation: | 1. Laboratory of Reaction and Separation Technology, Qingdao Agricultural University, Qingdao, 266109, PR China;2. East China University of Science and Technology, Shanghai, 200237, PR China;3. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, 750021, PR China;1. Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP–Av.Lineu Prestes, 2242, Butantã, São Paulo Brazil;2. Faculdade de Tecnologia SENAI Antoine Skaf, Sao Paulo Brazil;3. Instituto de Pesca, Agência Paulista de Tecnologia e do Agronegócio, Sec. Agricultura e Abastecimento do Estado de São Paulo, Sao Paulo Brazil;1. College of Chemical Engineering and Environment, North University of China, Taiyuan 030051, China;2. The Third Hospital of Shanxi Medical University, Taiyuan 030053, China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. State Key Laboratory of Pollution Control and Resource Reuse, School of The Environment, Nanjing University, Nanjing, 210093, PR China;2. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing, 210044, PR China;3. School of Government, Nanjing University, Nanjing, 210093, PR China;4. State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation, Chinese Academy for Environmental Planning, Beijing, 100012, PR China;1. Key Laboratory of Fluid and Power Machinery, Ministry of Education, School of Energy and Power Engineering, Xihua University, Chengdu, 610039, PR China;2. Vehicle Measurement, Control and Safety Key Laboratory of Sichuan Province, School of Automobile and Transportation, Xihua University, Chengdu, 610039, PR China;3. College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Guanghan, 618307, China;4. Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK |
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| Abstract: | The flow behavior of high-temperature ash (HTA) and low-temperature ash (LTA) of high calcium coal in the heating process was investigated systematically. By means of the heating stage microscope, the behavioral changes of samples were studied visually. The composition and mineral matters transformations of HTA and LTA samples were analyzed by X-ray fluorescence and X-ray diffraction. The results show that the original composition of HTA sample is different from that of LTA sample. In addition, the HTA and LTA samples experience the shrinkage, fusion and spreading processes in succession. However, the volume change of HTA sample is different from that of LTA sample. The volume of LTA sample shows a slow change at the temperature lower than 800 °C, while the volume of HTA sample is unchanged. In the temperature range of 800°C–1100 °C, the remarkable shrinkage of HTA and LTA samples are demonstrated. The formation of srebrodolskite and gehlenite attributes to this volume change. Moreover, the sharp shrinkage of HTA and LTA samples is indicated at 1100°C–1300 °C. This is caused by the formation of eutectics. Because of the diverse content and species of mineral matters in LTA sample, the volume change of LTA sample is more remarkable than that of HTA sample. The maximal shrinkages of LTA and HTA sample are 57% and 53%, respectively. |
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| Keywords: | Low-temperature ash High-temperature ash Heating stage microscope Mineral matters Shrinkage |
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