Understanding the effect of dolomite additive on corrosion characteristics of straw biomass ash through experiment study and molecular dynamics calculations

Liangqian Zheng, Jing Jin, Ruipu Zhang, Zhongyi Liu and Li Zhang

Energy, 2023, vol. 271, issue C

Abstract: Experiments and molecular dynamics calculations were conducted to study the corrosion characteristics of straw biomass ash with dolomite as an additive. The results showed that the corrosion of metal by straw ash followed a parabolic law with respect to time, and this corrosion gradually reduced after adding dolomite. At 650 °C, the surface of straw ash almost completely sintered and melted and was composed of SiO2, KCl, K2Si4O9 and K2CrO4. The corrosion layer contained cracks and many acicular Fe–Cr oxides. After adding 5% dolomite, the corrosion rate decreased by 57.74%. The ash layer loosened and was mainly composed of CaMgSi2O6, CaSiO3 and MgSiO3. No evident cracks were observed in the corrosion layer. As the temperature increased, the absolute value of the binding energy of KCl on the Fe2O3 and dolomite surfaces increased. Moreover, stronger chemical interactions were observed between the K+, Cl−, and dolomite. On the same surface, the diffusion coefficient of K+ was higher than that of Cl−. At the same temperature, the diffusion coefficient of K+ and Cl− on the dolomite was greater than on the Fe2O3. KCl was more likely to combine with dolomite than with the metal surface, alleviating the metal corrosion caused by biomass ash.

Keywords: Straw biomass ash; Corrosion characteristics; Dolomite; Additive; Molecular dynamics (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544223003444
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:271:y:2023:i:c:s0360544223003444

DOI: 10.1016/j.energy.2023.126950

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().