Reducing fly ash deposition by pretreatment of brown coal: Effect of aluminium on ash character |
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| Affiliation: | 1. Netherlands Energy Research Foundation ECN, P.O. Box 1, 1755 ZG Petten, Netherlands;2. State Electricity Commission of Victoria, R&D Dept. Springvale Road, Mulgrave, Victoria 3170, Australia;3. University of Newcastle, Department of Chemical Engineering, Newcastle, NSW 2308, Australia;1. TU Bergakademie Freiberg, Institute of Energy Process Engineering and Chemical Engineering (IEC), Fuchsmühlenweg 9, 09599 Freiberg, Germany;2. RWE Power AG, Kraftwerk Niederaußem, Werkstraße 1, 50129 Bergheim, Germany;1. Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, Xinjiang Uygur Autonomous Region, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China;2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;3. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Department of Thermal Engineering, Xi’an Jiaotong University, Xi’an 710049, China;1. Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Wuhan, Hubei 430074, China;2. The University of Queensland, Sustainable Minerals Institute, The Julius Kruttschnitt Mineral Research Centre, Brisbane, Queensland 4068, Australia;1. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. Stat Grid Shandong Electric Power Research Institute, Ji’nan 250002, China |
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| Abstract: | The effect of pretreatment on the structure and the related fouling/slagging behaviour of fly ash from brown coal has been investigated. Condensable sodium salts and low melting sodium silicates are known as fouling and slagging materials. Experimental proof is given that less of such components were formed after treatment of Loy Yang brown coal with water and, particularly, with Al compounds.For the range of temperatures applied (1000–1400°C) in a drop tube furnace, the quantity of condensable salts generated was found to depend only on the amount of sodium in Loy Yang coal. Aluminium had the effect of reducing the sodium level by ion exchange and thus the formation of fouling ash components. The stickiness of sodium silicates from this coal was also shown to be reduced by aluminium. |
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