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Molecular Dynamics Simulation for Structural Evolution of Mixed Ash from Coal and Wheat Straw

Abstract

We conducted molecular dynamics (MD) simulations to investigate the structural evolution of molten slag composed of wheat straw (WS) and Shenhua (SH) coal. The content of wheat straw in the slag was varied from 0 to 100 wt%. The MD results indicated a slight reduction in the sharpness of the radial-distribution-function curve of each ion–oxygen pair and a decrease in bonding strength with increasing WS content. WS introduced many metal ions to the ash system, increasing its overall activity. The number of bridging and non-bridging oxygen atoms changed upon straw addition, which affected the stability of the system. There were relatively few highly coordinated Si ions. The number of low-coordination Si was highest for a WS content of 30%, at which the density reached a minimum value. The degree of ash polymerization was analyzed by counting the number (Q) of tetrahedra with the number (n) of the bridging oxygen atoms. With increasing WS content, Q4 (tetrahedral Si) decreased, whereas Q3, Q2, Q1, and Q0 increased. Q4 reached a minimum value for a WS content of 30%, at which point the degree of ion aggregation was the weakest and the degree of disorder was the strongest.
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Category

Academic article

Language

English

Author(s)

  • Hengsong Ji
  • Xiang Li
  • Mei Zhang
  • Zhenqiang Li
  • Yan Zhou
  • Xiang Ma

Affiliation

  • SINTEF Industry / Metal Production and Processing
  • Jiangsu University

Year

2022

Published in

Processes

Volume

10

Issue

2

View this publication at Norwegian Research Information Repository