Citation: LI Ming-qiang, DU Mei-fang, WU Xiao-jiang, ZHOU Lei, ZHANG Zhong-xiao. Micromechanism of deposition for initial layer sediments of boiler[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(2): 157-162. shu

Micromechanism of deposition for initial layer sediments of boiler

1.
1. College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China;

Corresponding author: ZHANG Zhong-xiao,
Received Date: 6 June 2012
Available Online: 28 August 2012
Fund Project: 国家自然科学基金(51276212) (51276212) 上海市青年科技启明星计划(11QB1402100)。 (11QB1402100)

The analysis of XRD indicates that slag is similar with minerals in the initial sediments. However, the proportion of bauxite Al₂O₃, hematite Fe₂O₃ has a big difference. The electric structure, elastic constants of Al₂O₃ and Fe₂O₃ were calculated using the ultra soft pseudo-potential plane-wave method based on the first-principles. The results show that from the structure of material, the accumulation mode of Al³⁺ and O^2- in Al₂O₃ crystal is sparser than that of Fe³⁺ and O^2- in Fe₂O₃, which is the reason for their different properties. For their chemical bonds in the direction of <100> and in tangential, Fe-O is more easy to deformate and fracture than Al-O, leading to Fe₂O₃ deposition in the clean water wall. For Fe₂O₃, tangential surface plays a key role for its deposit.
- elastic propertie,
- electronic structure,
- coal ash,
- first-principles
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