Investigation on ash fusion behavior modification of wheat straw by sludge addition. (October 2021)

• Record Type: Journal Article
• Authors: Li, Fenghai; Zhao, Chaoyue; Li, Junguo; Li, Yang; Zhao, Huimin; Fan, Hongli; Xu, Meiling; Wang, Zhiqing; Huang, Jiejie; Fang, Yitian
• Is Part Of: Journal of the Energy Institute. Volume 98(2021)
• Page Start: 1
• Page End: 10
• Publication Date: 2021-10
• Subjects: Wheat straw -- Different sludges -- Influences -- Ash fusion temperature -- Variation mechanisms; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2021.05.007
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: Energy utilization of biomass has attracted great interests. To decrease ash-related issues during straw gasification and mitigate sludge environmental pollution, the influences of three sludges [aluminum plant sludge (APS), paper-making sludge (PMS), and municipal waste-water sludge (MWS)] on the ash fusion behaviors of wheat straw (WS) and their variation mechanisms under reducing atmosphere were investigated. The ash fusion temperatures (AFTs) of mixed WS increased following APS > PMS > WMS when they were equal. The ratio of bridging-oxygen bonds and nonbridging-oxygen bonds of WS mixture decreased more obviously with APS addition than that of MWS, causing the WS-APS mixture AFT increased more quickly than that of WS-MWS. The formations of high melting-point (MP) KAlSiO4, MgAl2 O4 and their increasing contents by APS addition resulted in the AFT increased obviously; the increase in relative high MP Ca3 MgSi2 O8 caused the AFT increase moderately with increasing PMS percentage; with MWS addition, the increasing CaMgSiO4 content led to a slow increase in the AFTs. The variations in liquid-phase content in the WS mixtures based on FactSage calculation were also explained the AFT variations. Highlights: Three sludge all made the ash fusion temperatures (AFTs) of wheat straw mixture increase. The increase followed sludge of aluminum plant (APS), paper-making, municipal sewage (MS). NBO/BO ratio decreasing degree with APS or WMS addition explained AFT variation difference. Formations of high melting point aluminum- or calcium-mineral caused the AFT increase. Variations in mineral composition and liquid-phase content illustrated the AFT change.