Effect of coal particle size distribution on packed bed pressure drop and gas flow distribution

Fuel ◽  
2006 ◽  
Vol 85 (10-11) ◽  
pp. 1439-1445 ◽  
Author(s):  
M KEYSER ◽  
M CONRADIE ◽  
M COERTZEN ◽  
J VANDYK
Keyword(s):  
Particle Size ◽  
Pressure Drop ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Coal Particle ◽  
Gas Flow ◽  
Flow Distribution ◽  
Packed Bed

Study on Coal Particle Combustion Characteristics and NO Emission in a Hot Laminar Gas Flow

2017 ◽  
Author(s):  
MingYan Gu ◽  
Dawei Yan ◽  
XianHui He ◽  
Dan Yan ◽  
FengShan Liu ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Coal Particle ◽  
Gas Flow ◽  
Combustion Process ◽  
Mass Ratio ◽  
Gas Temperature ◽  
Uniform Size ◽  
Coal Particles

The combustion and NO formation characteristics of coal particles of different size distributions in a laminar gas flow were investigated by numerical simulation. The variation of coal particle size distribution was obtained by changing the mass ratio of small-sized coal to large-sized coal. The gas-phase combustion was modeled using GRI-Mech 3.0. The particle motion was simulated using a trajectory model. The results show that the coal particle size distribution has a significant impact on combustion process and NO distribution. Coal particles of uniform size at either 105 or 75 μm results in a higher NO concentration than coal consisting of both the large and the small particles. The smaller-sized coal particles experience a rapid volatile release, a higher maximum gas temperature, and a higher maximum NO concentration. Increasing the mass ratio of the smaller-sized coal particles changes the gas temperature and the averaged NO distribution and lowers the maximum NO concentration.

scholarly journals Numerical Simulations of Molten Breakup Behaviors of a de Laval-Type Nozzle, and the Effects of Atomization Parameters on Particle Size Distribution

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1027
Author(s):  
Lianghui Xu ◽  
Xianglin Zhou ◽  
Jinghao Li ◽  
Yunfei Hu ◽  
Hang Qi ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Gas Flow ◽  
Nozzle Geometry ◽  
Particle Model ◽  
Process Conditions ◽  
Operating Pressure ◽  
Gas Temperature ◽  
Tracking Model

In this work, an atomizer with a de Laval-type nozzle is designed and studied by commercial computational fluid dynamics (CFD) software, and the secondary breakup process during atomization is simulated by two-way coupling and the discrete particle model (DPM) using the Euler-Lagrange method. The simulation result demonstrates that the gas flow patterns greatly change with the introduction of liquid droplets, which clearly indicates that the mass loading effect is quite significant as a result of the gas-droplet interactions. An hourglass shape of the cloud of disintegrating molten metal particles is observed by using a stochastic tracking model. Finally, this simulation approach is used for the quantitative evaluation of the effects of altering the atomizing process conditions (gas-to-melt ratio, operating pressure P, and operating gas temperature T) and nozzle geometry (protrusion length h, half-taper angle α, and gas slit nozzle diameter D) on the particle size distribution of the powders produced.

Effect of Moisture Content on Fluidization of Wet Brown Coal Particle with Wide Particle Size Distribution

2014 ◽  
Vol 40 (4) ◽  
pp. 299-305 ◽  
Author(s):  
Kenichi Arima ◽  
Isao Torii ◽  
Ryuhei Takashima ◽  
Tetsuya Sawatsubashi ◽  
Masaaki Kinoshita ◽  
...  
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Brown Coal ◽  
Coal Particle ◽  
Wide Particle Size Distribution ◽  
Effect Of Moisture
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