Ash deposition characteristics of Moolarben coal and its blends during coal combustion

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• 作者：Byoung-Hwa Lee ; Sang-In Kim ; Seung-Mo Kim…
• 关键词：Moolarben Coal ; Ash Deposition ; Capture Efficiency ; Blended Coal
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：33
• 期：1
• 页码：147-153
• 全文大小：1,242 KB
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• 作者单位：Byoung-Hwa Lee (1)
  Sang-In Kim (2)
  Seung-Mo Kim (2)
  Dong-Hun Oh (3)
  Sushil Gupta (4)
  Chung-Hwan Jeon (2)
  
  1. Boiler R&D Center, Doosan Heavy Industries & Construction Co., Ltd., Seoul, Korea
  2. School of Mechanical Engineering, Pusan Clean Coal Center, Pusan National University, Busan, 609-735, Korea
  3. Power Generation Department, Korea Midland Power Co., Ltd., Seoul, Korea
  4. Center for Sustainable Materials Research and Technology, School of Materials Science & Engineering, University of New South Wales, Canberra, Australia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

We report a systematic and comprehensive laboratory investigation of the ash deposition behavior of Moolarben (MO) coal, which has recently begun to be imported into Korea. Ash deposition experiments were conducted in a drop tube reactor, and a water-cooled ash deposit probe was inserted into the reactor to affix the ash. The tests were conducted using five types of single coals (two bituminous and three sub-bituminous, including MO coal) and blended coals (bituminous coal blended with sub-bituminous coal). Two indices represent ash deposition behavior: capture efficiency and energy-based growth rate. A thermomechanical analysis evaluated the melting behavior of the resulting ash deposits. The MO coal had the least ash deposition of the single coals due to its high melting temperature, indicated by high ash silica content. Indonesian sub-bituminous coals formed larger ash deposits and were sticky at low temperatures due to relatively high alkali content. However, blends with MO coal had greater ash deposition than blends with other bituminous coals. This non-additive behavior of MO coal blends is likely due to interactions between ash particles. Coals with higher silica content more effectively retain alkali species, resulting in lower melting temperatures and larger ash deposits. Therefore, we recommend that when blending in a boiler, silica-rich coals (SiO₂>80%, SiO₂/Al₂O₃> 5) should be blended with relatively low-alkali coals (Na₂O+K₂O<3%), and the blending ratio of the silica-rich coals indicates less than 10%, which can safely operate the boiler.