Research on the release of gases during the bituminous coal combustion under low oxygen atmosphere by TG–FTIR. Issue 3 (June 2018)

• Record Type: Journal Article
• Authors: Liu, Liangliang; Wang, Zhiqiang; Che, Kai; Qin, Yukun
• Is Part Of: Journal of the Energy Institute. Volume 91:Issue 3(2018)
• Page Start: 323
• Page End: 330
• Publication Date: 2018-06
• Subjects: Coal -- Low oxygen atmosphere -- Kinetics -- Released gases -- TG–FTIR; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2017.05.006
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: The recirculation of boiler tail gas with a low oxygen concentration can reduce NOx emissions. Experiments on bitumite combustion were carried out using simultaneous TG/FTIR dynamic runs with different atmospheric compositions, 2%, 6%, 10%, and 12% O2 . Reducing oxygen concentrations led to the burnout temperature shifting to higher temperature and coal combustion becoming more challenging. The reducing gas (CO, CH4 ) emissions were abundant between 330 °C and 690 °C. However, along with the reduction in oxygen, CH4 intensity increased, while the CO precipitation peak lowered. Kinetic parameters were defined using the Coats-Redfern model. According to the data obtained, bitumite combustion activation energy increased as oxygen concentration increased. Graphical abstract: Experiments on bitumite combustion were carried out by simultaneous TG/FTIR dynamic runs under different atmosphere. Along with the reduction of oxygen concentration, the burnout temperature shifted to higher temperature and the combustion of coal became harder, while the activation energy of bitumite combustion decreases. The emission of reducing gas (CO, CH4 ) was abundant between 330 °C and 690 °C. Highlights: The combustion characteristics and precipitation of gas are necessary to the low nitrogen combustion technology. With the reduction of oxygen, the burnout temperature shifted to higher temperature and the combustion became harder. With the reduction of oxygen, the intensity of the CH4 increased, while the precipitation peak of CO is lower. With the reduction of oxygen, the activation energy of bitumite combustion increases as oxygen concentration increases.