Kinetic relationship between NO/N2O reduction and O2 consumption during flue-gas recycling coal combustion in a bubbling fluidized-bed

Mathematical modelling of Collie coal pyrolysis considering the effect of steam produced in situ from coal inherent moisture and pyrolytic water

“…Using a constant value of 176 kJ mol À1 for the global surface reaction activation energy, E 0 , for lignite char steam gasification from the literature [7], k 0 o is estimated by best-fitting the gasification data (with minimal transport effects), using Eqs. (4) and (5). k 0 o , for raw coal char prepared at 900 and 1000°C and demineralised coal char prepared at 1000°C, is found to be 34.3, 21.0, 4.39 g m À2 s À1 (g m À3 ) À0.5 , respectively.…”

“…1); k 0 o in this case is found to be 22.1 g m À2 s À1 (g m À3 ) À0. 5 . The global mth-order approach, tested with other gasification data under different steam partial pressures which could possibly result from moisture in coal of various moisture contents (at 900 and 1000°C), was found to be adequate for modelling the char gasification.…”

“…The ultimate volatile yields are taken from fast-heating pyrolysis experiments of pf-sized (90-106 lm) particles using a drop-tube/fixed-bed reactor [4] having features similar to those used by Hayashi and coworkers [5], where the dried coal was fed in one pulse into the reactor with minimised contact between the char and volatiles.…”

“…The char in-situ steam gasification process is complicated by the volatile cracking and steam reforming in the reactor [5,6], the latter affecting the steam availability for the char gasification. A coal pyrolysis model is first developed, followed by a char steam gasification model.…”

Effect of Operating Conditions on NOx and CO Emissions in a Pilot‐Scale Vortexing Fluidized‐Bed Combustor with Flue Gas Recirculation

“…As one of the most efficient NO x emission reduction methods, FGR has been applied in reducing NO x emissions by numerous researchers [1][2][3][4][5][6][7][8][9][10]. However, a fuel-rich zone usually must be created in the application of this technique.…”