A critical analysis of the acceleration length and pressure profile of single-particle systems in a circulating fluidized bed

2008 ◽  
Vol 3 (5) ◽  
pp. 560-571 ◽  
Author(s):  
Mitali Das ◽  
B. C. Meikap ◽  
R. K. Saha
Keyword(s):  
Fluidized Bed ◽  
Single Particle ◽  
Critical Analysis ◽  
Circulating Fluidized Bed ◽  
Pressure Profile ◽  
Particle Systems

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

Hydrodynamics of Double-Dipleg Circulating Fluidized Beds for Waste Incineration

2003 ◽  
Author(s):  
Xiaoyin Yun ◽  
Weigang Lin ◽  
Shaohua Wu
Keyword(s):  
Fluidized Bed ◽  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Circulating Fluidized Bed ◽  
Waste Incineration ◽  
Pressure Profile ◽  
Gas Velocity ◽  
New Type ◽  
Superficial Gas Velocity

In order to solve the problems of high temperature chlorine induced corrosion and the emission of dioxins, a new type of double-dipleg circulating fluidized bed incinerator is under development at the Institute of Process Engineering, Chinese Academy of Sciences. Understanding the hydrodynamics of such new type of CFB incinerator are of crucial importance for successful design and operation of the system. Experiments have been carried out in a lab-scale double-dipleg circulating fluidized bed to study the hydrodynamics of such system. The investigation is focused on the pressure profile in the loop and residence time distribution of particles with different sizes and densities in the secondary dipleg. The results show that the pressure profile in such system is similar to that in the conventional CFB. The residence time distribution (RTD) function of particles in the second dipleg varies with particle recirculating rate, superficial gas velocity and the characteristics of the particles, such as density and size. The mean residence time of particles decreases sharply with an increase of the particle re-circulating rate and slightly decreases as the superficial gas velocity increases. It appears that the density of particle has a stronger influence on the residence time than the particle size. The lighter particles have a shorter residence time. The residence time distribution function of the particles is described by a tank-in-series model. The implication of the results to the design and operation of the double-dipleg circulating fluidized bed incinerator are discussed.

Real Time Implementation of Standpipe Model for Solids Flow in Circulating Fluidized Bed

2018 ◽  
Author(s):  
Rupendranath Panday ◽  
Lawrence Shadle ◽  
Ronald Breault
Keyword(s):  
Real Time ◽  
Fluidized Bed ◽  
Velocity Measurement ◽  
Circulating Fluidized Bed ◽  
Model Development ◽  
Stable Process ◽  
Nonlinear Least Squares ◽  
Pressure Profile ◽  
Optimization Techniques ◽  
Time Model

Increased accuracy of solids flow meters can be achieved with sensor fusion; the combination of solids velocity measurement with other process sensors to define the process state of the solids while they flow. In a circulating fluidized bed aeration flow, temperature measurements, and pressure differentials are routinely measured to ensure stable process operations. These process measurements were used as input to real-time model of the standpipe where the velocity measurement was taken to determine the actual solids bed density. The model development and implementation are described with the objective of updating the measured flows continuously in real time. Real time optimization techniques use the pressure measurements for inferring voidage and apply the inferred values to estimate the pressure profile and aeration split. In essence, the approach becomes solving nonlinear least squares problem and closure of mass balance of gas in real time.

Modeling of Solid Fuel Combustion in Furnaces with a Circulating Fluidized Bed

2008 ◽  
Vol 39 (1) ◽  
pp. 65-78
Author(s):  
Yu. S. Teplitskii ◽  
V. A. Borodulya ◽  
V. I. Kovenskii ◽  
E. P. Nogotov
Keyword(s):  
Fluidized Bed ◽  
Solid Fuel ◽  
Circulating Fluidized Bed ◽  
Fuel Combustion ◽  
Solid Fuel Combustion
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