Study on Co-combustion Characteristics of Superfine Coal with Conventional Size Coal in O<sub>2</sub>/CO<sub>2</sub> Atmosphere

Abstract

The pulverized coal combustion in O 2 /CO 2 atmosphere is one of the promising new technologies which can reduce the emission of carbon dioxide and NOx. In this study, the combustion behaviors of different mixing ratio of Shenhua coal with 20 μm and 74 μm particle size in the O 2 /CO 2 atmosphere and air atmosphere were studied by using a thermal-gravimetric analyzer. The combustion characteristics such as ignition and burnout behavior were investigated in the temperature from 20℃ to 850℃. The influence of mixing ratio on combustion characteristics was conduced. The results obtained showed that the ignition temperature of the two kinds of particle size in O 2 /CO 2 atmosphere is higher than in the air, while the activation energy in O 2 /CO 2 atmosphere is lower. With the increasing ratio of 20 μm superfine pulverized coals, the ignition temperature and the activation energy decreased, while the DTG peak value increased, the maximum burning rate position advanced. There were three trends for the ignition temperature curve with the increasing of superfine coal ratio: the ignition of the mixed coal decreased rapidly, then changed less, at last reduced quickly.

Thermal behaviour of low-rank Indian coal fines agglomerated with an organic binder

“…The discrepancies of the activation energies determined in the present study and those found by various authors for the decomposition or degradation of coal, graphite, char, bio-char, and coal-biomass blends are found to be different due to the different kinetic models used in the calculation at different experimental conditions and variation in the types of materials used [4,[7][8][9][10][11][12][13][14][15][16][17][18][19][20]46] (Table S5 in ESM). Thus, the possible kinetic rate equations for decomposition of carbonized ACFs (CN-1, CN-2, and CN-3) are given below:…”

“…The complete combustion kinetics analysis is necessary for the design and operation of a combustion system. Many researchers have worked on the thermal decomposition of carbonaceous materials, including coals, under different environmental conditions [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. As stated in our previous report [21], the coals from Nagaland (India) have a lowash, high-volatile, high-sulphur contents and are mostly non-caking and swelling in nature.…”