Spent coffee grounds: A review on current utilization

Air- and oxygen-blown characterization of coal and biomass by thermogravimetric analysis

Combustion properties of coal gangue using thermogravimetry–Fourier transform infrared spectroscopy

Waste-to-energy technology integrated with carbon capture – Challenges and opportunities

TG-MS-FTIR study on pyrolysis behavior of superfine pulverized coal

Evaluation on the oxy-fuel combustion behavior of dried sewage sludge

An assessment on co-combustion characteristics of Chinese lignite and eucalyptus bark with TG–MS technique

The combustion behaviors of lignite/eucalyptus bark under oxy-fuel condition were assessed based on a thermal analysis technique. The influences of oxygen concentration, heating rates and blending ratios on oxy-fuel combustion performances were revealed, which were compared with those in air. The ignition and comprehensive combustion indices increased with increasing oxygen contents during oxy-fuel combustion. At three heating rates of 10, 15 and 20 K min−1, the average comprehensive performance indices of lignite/eucalyptus bark in 40 %O2/60 %CO2 were about 5–7 times more than those in air. The average comprehensive performance indices of lignite/eucalyptus bark in air were about 2–3 times more than those in O2/CO2 atmosphere at analogous oxygen content. At heating rate of 20 K min−1, the ignition and comprehensive performance indices of lignite/eucalyptus bark in 25 %O2/75 %CO2 were very near to those in air. The combustion kinetics were also evaluated in conjunction with volatile matter and fixed carbon burning periods using Doyle’s and Coats–Redfern’s models. The oxy-fuel combustion kinetics of lignite/eucalyptus bark at oxygen content of 30 % was similar to that in air. There were more significant synergistic effects between lignite and eucalyptus bark during their co-combustion in air and O2/CO2 with oxygen contents of 25 and 30 %.

Evaluation on oxy-fuel co-combustion behavior of Chinese lignite and eucalyptus bark

The combustion behaviors of anthracite coal/spent coffee grounds under oxy-fuel condition were assessed by a thermal analysis technique. At heating rates of 10–40 K min−1, the ignition temperatures and burnout temperatures of all anthracite coal/spent coffee grounds blends decreased with increasing the blending ratios of biomass or oxygen contents in O2/CO2 atmospheres. The ignition temperatures of all samples at the similar oxygen content in oxy-fuel with that of air were higher than that in air atmosphere. In 30 % O2/70 % CO2 atmosphere, the average ignition and comprehensive performance indices of anthracite coal/spent coffee grounds at 40 K min−1 were about 4 times and 18 times more than that at 10 K min−1, respectively. At heating rate of 20 K min−1, the comprehensive performance indices of all samples in 30 % O2/70 % CO2 were very close to those in air. In air and O2/CO2 (21–40 % oxygen contents) atmospheres, the activation energies of release and combustion for volatile matters in the blends ranged from 33.66 to 147.32 kJ mol−1. Activation energies of char combustion in the blends ranged from 21.06 to 109.49 kJ mol−1. There were more significant synergistic effects between anthracite coal and spent coffee grounds during co-combustion in air and oxy-fuel atmospheres at 40 K min−1.

Feng Xue

Papers

Evaluation on the oxy-fuel combustion behavior of dried sewage sludge

An assessment on co-combustion characteristics of Chinese lignite and eucalyptus bark with TG–MS technique

Evaluation on oxy-fuel co-combustion behavior of Chinese lignite and eucalyptus bark

Experimental investigation on the oxy-fuel co-combustion behavior of anthracite coal and spent coffee grounds