Study on reactivity characteristics and synergy behaviours of rice straw and bituminous coal co-gasification. (November 2016)

• Record Type: Journal Article
• Authors: Wei, Juntao; Guo, Qinghua; Chen, Handing; Chen, Xueli; Yu, Guangsuo
• Is Part Of: Bioresource technology. Volume 220(2016)
• Page Start: 509
• Page End: 515
• Publication Date: 2016-11
• Subjects: Co-gasification -- Reactivity characteristics -- Synergistic effect -- Inhibiting effect; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2016.08.116
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Transformation of active K/Ca in co-gasification was quantitatively determined. Active Ca transformation was promoted but active K transformation was inhibited. Inhibiting effect was converted to synergistic effect at characteristic conversion. Higher temperature and lower biomass ratio meant higher characteristic conversion. Synergy behaviours were related to active K/Ca transformation in co-gasification. Abstract: Co-gasification of rice straw (RS) and Shenfu bituminous coal (SF) was conducted in a thermogravimetric analyzer (TGA) to explore the effects of gasification temperature and blend ratio on reactivity characteristics and synergy behaviours of co-gasification. Moreover, the relationship between the synergy and the K/Ca transformation in co-gasification was studied using flame atomic absorption spectrum (FAAS) and in-situ heating stage microscope. The results showed that the whole reactivities increased with increasing RS proportion and gasification temperature. The transformation of water-soluble and ion-exchanged ( ws-ie ) calcium was enhanced in whole co-gasification and the ws-ie potassium transformation was obviously inhibited in mid-late reaction. Hence, synergy behaviours were synthetically determined by the enhancement of Ca deactivation and the strengthening of K catalysis. The inhibiting effect was occurred in initial co-gasification and was converted to the synergistic effect at a characteristic conversion, which decreased with increasing RS proportion and decreasing gasification temperature.