scholarly journals Shape Effect of the Riser Cross Section on the Full-Loop Hydrodynamics of a Three-Dimensional Circulating Fluidized Bed

ACS Omega ◽  
2020 ◽  
Vol 5 (11) ◽  
pp. 5784-5795 ◽  
Author(s):  
Shiliang Yang ◽  
Shuai Wang
Keyword(s):  
Fluidized Bed ◽  
Cross Section ◽  
Circulating Fluidized Bed ◽  
Three Dimensional ◽  
Shape Effect

Evaluation of a Three-Dimensional Numerical Model of a Scaled Circulating Fluidized Bed

2001 ◽  
Vol 40 (23) ◽  
pp. 5081-5086 ◽  
Author(s):  
Claus H. Ibsen ◽  
Tron Solberg ◽  
Bjørn H. Hjertager
Keyword(s):  
Numerical Model ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Three Dimensional

Solids Flow Pattern in the Bottom Zone of a Rectangular Cross-Section Circulating Fluidized Bed

2003 ◽  
Author(s):  
Hong-Shun Li ◽  
Yi-Jun Wang ◽  
Shi-Ping Jin
Keyword(s):  
Flow Pattern ◽  
Fluidized Bed ◽  
Cross Section ◽  
Quartz Sand ◽  
Circulating Fluidized Bed ◽  
Rectangular Cross Section ◽  
Temperature Response ◽  
Cold Model ◽  
Hot Particles ◽  
Bottom Zone

Solids flow pattern in the bottom zone of a rectangular cross-section CFB was investigated by using hot particles as the tracer. The experiments were carried out in a cold model circulating fluidized bed. The riser has an inner cross-section of 0.3 m by 0.5 m and a height of 5.8 m. The solids were returned into the riser at a height of 0.75 m above the air distributor within an angle of about 40 degree. Quartz sand was used as the bed material. The hot particles were also quartz sand but with a little smaller size. Specially designed miniature electrically heating devices were installed flush with the inner bed wall or inside the bed. At each run, about 10–15 cm3 hot particles were slowly pulled into the bed. The temperature response around the device was measured with four copper-constantan thermocouples. Based on the experimental results, a 3-D core-annulus model describing the solids flow pattern in the bottom zone of the CFB riser is proposed.

Particle velocity profiles in a circulating fluidized bed riser of square cross-section

1995 ◽  
Vol 50 (2) ◽  
pp. 237-244 ◽  
Author(s):  
J. Zhou ◽  
J.R. Grace ◽  
C.J. Lim ◽  
C.M.H. Brereton
Keyword(s):  
Fluidized Bed ◽  
Cross Section ◽  
Particle Velocity ◽  
Circulating Fluidized Bed ◽  
Velocity Profiles

Combustion Behavior and SO2, NOx Emissions of an Anthracite Coal in a Circulating Fluidized Bed

2005 ◽  
Author(s):  
Leming Cheng ◽  
Zhongyang Luo ◽  
Zhenglun Shi ◽  
Haixiao Zheng ◽  
Qinghui Wang ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Cross Section ◽  
Circulating Fluidized Bed ◽  
Nox Emissions ◽  
So2 Emission ◽  
Combustion Behavior ◽  
Excess Air ◽  
Anthracite Coal ◽  
Bed Temperature ◽  
Experimental Researches

Combustion behavior and SO2, NOx emissions of anthracite coal in a circulating fluidized bed are reported in this paper. Experimental researches were done on a 1 MWt circulating fluidized bed facility with a 0.31 m × 0.31 m cross section and 11.2 m height combustor. The anthracite coal with 6.28% volatile and 3.76% sulfur content burns steadily during the test. The bed was operated under different temperature, Ca/S ratio and excess air. A limestone containing 75% CaCO3 and 15% MgCO3 was used as the sulfur sorbent. Results show that the SO2 emission varies with operating bed temperature and more than 90% sulfur capture efficiency can be reached while Ca/S is about 3. With Rosemount Analytical NGA2000, N2O, NO and NO2 were also measured in the test. It was found the majority content of NOx was NO and the least was NO2. Those NOx emissions change highly with the excess air number.

Three-Dimensional Eulerian–Eulerian Modeling of Gaseous Pollutant Emissions from Circulating Fluidized-Bed Combustors

2014 ◽  
Vol 28 (8) ◽  
pp. 5523-5533 ◽  
Author(s):  
Jun Xie ◽  
Wenqi Zhong ◽  
Baosheng Jin ◽  
Yingjuan Shao ◽  
Hao Liu
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Three Dimensional ◽  
Pollutant Emissions ◽  
Gaseous Pollutant ◽  
Eulerian Modeling

Three-dimensional modeling of fuel flow with a holistic circulating fluidized bed furnace model

2014 ◽  
Vol 117 ◽  
pp. 352-363 ◽  
Author(s):  
Markku Nikku ◽  
Kari Myöhänen ◽  
Jouni Ritvanen ◽  
Timo Hyppänen
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Three Dimensional ◽  
Three Dimensional Modeling ◽  
Fuel Flow ◽  
Dimensional Modeling

Validation and Application of Computational Modeling to Reduce Erosion in a Circulating Fluidized Bed Boiler

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Peter J. Blaser ◽  
Giorgio Corina
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Complex Geometry ◽  
Three Dimensional ◽  
Palm Kernel ◽  
Operational Experience ◽  
Solid Flow ◽  
Internal Surfaces ◽  
And Performance ◽  
Palm Kernel Shells

Abstract The 40 MW Strongoli power plant, located in the Calabria region of Italy, produces power from 100% biomass sources. The combustion of wood biomass, exhausted olive residues and palm kernel shells, occurs in a sand-filled, Circulating Fluidized Bed (CFB) combustor. Operational experience with the unit dates back to 2003. This paper describes the optimization of the boiler in order to minimize erosion on internal surfaces and structures. Detailed three-dimensional, transient, multiphase gas-solid flow fields were computed and are presented. Details of the complex geometry include the combustion chamber, cyclone, cyclone dipleg, seal pot, fluidized bed heat exchanger and cyclone outlet structures including suspension tubes. The gas-solid flow was computed using the commercially-available software package Barracuda, a CFD software based on a unique Eulerian-Lagrangian formulation that was essential to the success of the subject work. Both instantaneous and time-averaged results were obtained. Results were validated against operational erosion experience. The validated model, in turn, was utilized to redesign various components of the boiler, optimizing both erosion characteristics and performance behaviour of the system. The redesigned unit was commissioned in early 2012.

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