Fly ash suspensions stabilized by hydroxypropyl guar gum and xanthan gum for retarding spontaneous combustion of coal. Issue 12 (2nd December 2018)

• Record Type: Journal Article
• Authors: Shi, Quanlin; Qin, Botao; Bi, Qiang; Qu, Bao
• Is Part Of: Combustion science and technology. Volume 190:Issue 12(2018)
• Page Start: 2097
• Page End: 2110
• Publication Date: 2018-12-02
• Subjects: Spontaneous combustion of coal -- Fly ash suspensions -- Retard coal oxidation -- Rheology -- Stability; Combustion -- Periodicals; Combustion engineering -- Periodicals; 541.36105
• DOI: 10.1080/00102202.2018.1491845
• Languages: English
• ISSNs: 0010-2202

Abstract

ABSTRACT: This study evaluated the potential application of hydroxypropyl guar gum (HPG) and xanthan gum (XG) (HPG/XG weight ratio 1:1) to stabilize highly concentrated fly ash suspensions (FAS) (300 g/L) used for retarding spontaneous combustion of coal. The rheological behaviors of FAS were measured with different HPG/XG mixture concentrations including 1.2, 1.4, 1.6, 1.8, and 2 g/L, respectively. The effects of concentrations on the static stability of FAS were investigated to determine the optimal concentration. It was found that increasing HPG/XG concentration was beneficial to the viscoelasticity of FAS as evidenced by higher elastic modulus (G′), and FAS can be stabilized over 72 h when HPG/XG concentration increased to 1.6 g/L. Retarding spontaneous combustion experiments indicated that FAS significantly elevated the crossing point temperature of coal and reduced the carbon monoxide during low-temperature oxidation, efficiently retarding spontaneous combustion of coal.