scholarly journals Effect of parameters on performance of two-stage swirl-flow fluidized bed coal combustors.

1991 ◽  
Vol 24 (6) ◽  
pp. 703-708 ◽  
Author(s):  
J. K. Lee ◽  
K. H. Lee ◽  
J. G. Jang ◽  
Y. S. Shin ◽  
H. S. Chun
Keyword(s):  
Fluidized Bed ◽  
Swirl Flow ◽  
Two Stage

scholarly journals Pilot verification of a two-stage fluidized bed gasifier with a downer pyrolyzer using oxygen-rich air

Fuel ◽  
2022 ◽  
Vol 307 ◽  
pp. 121816
Author(s):  
Chao Wang ◽  
Mengjuan Zhang ◽  
Zhennan Han ◽  
Dingrong Bai ◽  
Wenli Duo ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Two Stage ◽  
Fluidized Bed Gasifier

Design of Hybrid Drying- Dedusting Unit Processor for Rough Rice Processing

2008 ◽  
Vol 4 (6) ◽  
Author(s):  
Law Chung Lim ◽  
Wan Ramli Wan Daud
Keyword(s):  
Moisture Content ◽  
Fluidized Bed ◽  
Separation Efficiency ◽  
Cross Flow ◽  
Drying Kinetics ◽  
Rice Husks ◽  
Two Stage ◽  
Fluidized Bed Dryer ◽  
Rough Rice ◽  
Superficial Gas Velocity

Advanced drying technology enables drying of rough rice and dedusting of rice husks to be carried out simultaneously in the same unit processor. This paper reports the efficiency of dedusting of rice husks in a two-stage inclined cross flow fluidized bed dryer and the drying kinetics of rough rice in a batch fluidized bed dryer as well as the conceptual design of a hybrid drying – dedusting unit processor. Experimental works had been carried out using rough rice (a Group D particle according to Geldart classification of powders) in a 2.5 m height two-stage inclined fluidized bed column of cross sectional area of 0.61m x 0.15m and a 3 m high batch fluidized bed dryer. The objectives of the study was to investigate the separation efficiency of dedusting of rice husks in the two-stage cross flow fluidized bed dryer and to study the drying kinetics of rough rice drying in the batch fluidized bed dryer. The experimental results showed that the dedusting separation efficiency at low superficial gas velocity gave unsatisfactory separation of merely 40% of rice husks. At higher superficial gas velocity, separation efficiency of rice husks as high as 93% was achieved. In addition, higher distributor inclination angle gave slightly improved separation efficiency. The drying kinetics showed that the residence time that is required to reduce the moisture content of rough rice to 18% (intermediate storage moisture content for second stage drying) is 3 minutes whereas the residence time that is required to reduce the moisture content to 13% (desirable final moisture content) is approximately 10 minutes regardless of the effect of kernel cracking. It was also found that higher drying temperatures gave higher drying rate. A conceptual design has been developed based on the results obtained in the studies. In order to maximize the heat utilization and to carry out two processes viz. dedusting and drying in one unit processor, it is suggested that drying – dedusting can be carried out in a multistage mode where drying is taken place at each stage while dedusting is taking place at the upper stage. This concept can be applied to a packed bed or a fluidized bed unit processor.

Sign in / Sign up

Export Citation Format

Share Document