A mechanism investigation of synergy behaviour variations during blended char co-gasification of biomass and different rank coals. (February 2019)

• Record Type: Journal Article
• Authors: Wei, Juntao; Gong, Yan; Guo, Qinghua; Chen, Xueli; Ding, Lu; Yu, Guangsuo
• Is Part Of: Renewable energy. Volume 131(2019)
• Page Start: 597
• Page End: 605
• Publication Date: 2019-02
• Subjects: Co-gasification -- Biomass -- Coal type -- Reactivity -- Synergy behaviour; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2018.07.075
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Co-gasification reactivity of rice straw and bituminous coal/anthracite blended chars under CO2 atmosphere was evaluated using thermogravimetric analysis, and the influences of coal type and gasification temperature on synergy behaviour variations on co-gasification reactivity as carbon conversions increased were quantitatively studied. Furthermore, the chemical forms and concentrations of AAEM species at different co-gasification conversions were quantitatively analyzed for revealing co-gasification synergy mechanism. The results demonstrate that as conversions increased, synergy behaviour on co-gasification reactivity of rice straw-bituminous coal blends was shown as the weakened inhibition effect firstly and then the enhanced synergistic effect. Moreover, the inhibition effect on co-gasification reactivity of rice straw-bituminous coal blends was sustained up to higher conversion with the increment of gasification temperature. Differing from rice straw-bituminous coal blends, synergistic effect on co-gasification reactivity of rice straw-anthracite blends was obviously enhanced at early stage of co-gasification and started to slowly weaken after reaching the most significant synergistic effect at middle stage of co-gasification. Additionally, it was revealed that synergy behaviour variations on co-gasification reactivity of rice straw-bituminous coal blends were mainly attributed to the combination effects of active K and Ca transformation during co-gasification, while those of rice straw-anthracite blends indicated a good correlation with active K transformation during co-gasification. Highlights: Synergy behaviour variations at different co-gasification conversions were quantified. Mineral matter transformation during co-gasification was quantitatively studied. Coal type showed great impacts on synergy behaviour variations on co-gasification reactivity. Mineral matter transformation could well correlate co-gasification synergy mechanism.