Voidage and Pressure Profile Characteristics of Sand−Iron Ore−Coal−FCC Single-Particle Systems in the Riser of a Pilot Plant Circulating Fluidized Bed

2008 ◽  
Vol 47 (11) ◽  
pp. 4018-4024 ◽  
Author(s):  
M. Das ◽  
B. C. Meikap ◽  
R. K. Saha
Keyword(s):  
Fluidized Bed ◽  
Single Particle ◽  
Pilot Plant ◽  
Iron Ore ◽  
Circulating Fluidized Bed ◽  
Pressure Profile ◽  
Particle Systems ◽  
Profile Characteristics

Hydrodynamic behavior of iron ore particles in a circulating fluidized bed reduction system

1995 ◽  
Vol 1 (2) ◽  
pp. 99-105 ◽  
Author(s):  
Yoon-Bong Hahn ◽  
In-Sik Nam ◽  
Dae-Gyu Park ◽  
II-Ok Lee
Keyword(s):  
Fluidized Bed ◽  
Iron Ore ◽  
Circulating Fluidized Bed ◽  
Hydrodynamic Behavior ◽  
Reduction System

Combustion of Wood Processing Residues in a Circulating Fluidized Bed

2003 ◽  
Author(s):  
Fernando Preto
Keyword(s):  
Fluidized Bed ◽  
Pilot Plant ◽  
Circulating Fluidized Bed ◽  
Combustion Efficiency ◽  
Tree Bark ◽  
Feed System ◽  
Wood Processing ◽  
System A ◽  
Bed Temperature ◽  
High Moisture Level

The combustion of wood processing residues was tested in the 0.8 MWth CANMET Circulating Fluidized Bed Combustor (CFBC) pilot plant. The specific residues tested were three different types of coniferous tree bark (i.e. from different locations to represent a range of possible fuels and fuel properties). Combustion conditions may be summarized as follows: fuel moisture levels 42–60%, fluidizing velocity 2.1–2.4 m/s; bed temperature 785–910 °C; maximum freeboard temperature 980–1070 °C and excess air levels 20–75%. The CFBC unit was able to burn the high moisture level fuels with no detrimental effect. In all trials the residues burned very well, with combustion efficiency greater than 99% based on overhead carbon loss. Emissions measurements were made of the following pollutant species CO, NOx, N2O, SO2, and dioxins and furans. The emissions levels were: 100–130 ppm NOx; <1 ppm N2O; 5–20 ppm SO2 and 400–1800 ppm CO. These emission levels are well below pollution guidelines for all major pollutants except CO. This however can be traced to the non-homogeneous nature of the coarse feed in the pilot plant. The problem can reasonably be addressed in a full-scale unit by a more stable feed system. A preliminary economic analysis of a new 25 MW FBC power plant firing these fuels was performed. Conservative inputs give a cost of 6 cents/kWh for the electricity produced and a economic wood haulage radius of 70 km.

The NO and N2O formation mechanism under circulating fluidized bed combustor conditions: From the single particle to the pilot-scale

1999 ◽  
Vol 77 (2) ◽  
pp. 275-283 ◽  
Author(s):  
Franz Winter ◽  
Gerhard Löffler ◽  
Christian Wartha ◽  
Hermann Hofbauer ◽  
Fernando Preto ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Formation Mechanism ◽  
Single Particle ◽  
Circulating Fluidized Bed ◽  
Pilot Scale ◽  
N2o Formation ◽  
Fluidized Bed Combustor
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