scholarly journals Modeling of particle size distribution of limestone in sulfur capture in air and oxy-fuel circulating fluidized bed combustion

2016 ◽  
Vol Volume 4 ◽  
pp. 41-52
Author(s):  
Jaakko Saastamoinen ◽  
Antti Tourunen ◽  
Timo Leino ◽  
Toni Pikkarainen
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Fluidized Bed Combustion ◽  
Circulating Fluidized Bed Combustion ◽  
Sulfur Capture

Reactivation Studies on Six Fly Ashes From Commercial CFB Boilers

2005 ◽  
Author(s):  
Y. Wu ◽  
J.-P. Charland ◽  
E. J. Anthony ◽  
L. Jia
Keyword(s):  
Particle Size ◽  
Fluidized Bed ◽  
Liquid Water ◽  
Circulating Fluidized Bed ◽  
Absorption Capacity ◽  
Fluidized Bed Combustion ◽  
Fly Ashes ◽  
Commercial Scale ◽  
Circulating Fluidized Bed Combustion ◽  
So2 Absorption

Six different fly ashes from commercial-scale circulating fluidized bed combustion (CFBC) boilers and the carbon-free residues of these ashes were hydrated with liquid water or steam to determine whether hydration could improve sorbent utilization in these samples under fluidized bed combustion conditions. After hydration, for two fly ashes (FA1 and FA6) and three carbon-free samples (FA2-A, FA3-A and FA6-A), the capacity for taking up SO2 showed limited or medium improvement; however, hydration was evidently ineffective in reactivating the remaining samples. It is believed that the reason samples FA6 and FA6-A show a relatively high improvement in SO2 absorption capacity is that these ashes had a larger particle size than any of the other fly ashes examined here. In general, even for these “reactivatable” fly ashes, reactivation by hydration with either liquid water or steam appeared far less promising than for bed ashes, which have been shown to exhibit significant improvement in sulphur capture during re-sulphation. Hydration, whether by steam or liquid water, is not recommended for fly ash, which has a very limited residence time in the boiler due to its small particle size and instead this paper recommends alternative strategies.

Mechanism of the Impact of Particle Size Distribution to Bed-Inventory Overturn for Pant-Leg Circulating Fluidized Bed

2013 ◽  
Vol 90 (4) ◽  
pp. 885-895 ◽  
Author(s):  
Jining Sun ◽  
Zhe Wang ◽  
Weiyu Cao ◽  
Haihang Wu ◽  
Zheng Li ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
The Impact

Prediction of Sorbent Performance in a Circulating Fluidized Bed Boiler Based on Petrographic Properties

2006 ◽  
Vol 129 (2) ◽  
pp. 565-571 ◽  
Author(s):  
Peter L. Rozelle ◽  
Sarma V. Pisupati ◽  
Alan W. Scaroni
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Bottom Ash ◽  
Circulating Fluidized Bed Boiler ◽  
Operating Data ◽  
Full Load ◽  
Full Load Operation

A method for prediction of sorbent consumption is presented here and has been developed based on plant operating data for a boiler in which several limestone and dolostone products were tested under similar firing conditions. The method considers the characteristic partitioning of calcium and sulfur between the flyash and bottom ash stream for the boiler, the feed particle size distribution of the sorbent, and petrographic properties of the sorbents. The predictions of sorbent usage were compared to plant operating data for five sorbents, of two distinct petrographic types. The plant operating data used featured full load operation. The five sorbents tested were all from Pennsylvania, and each contained greater than 40wt.% CaO. In four of the five cases, the predicted sorbent usage was within 10wt.% of the average full load sorbent usage by the boiler.

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