An Experiment on Solid Circulation Characteristics of a Dual Circulating fluidized Bed Based on Biomaterial Properties and Mechanics Properties

2012 ◽  
Vol 600 ◽  
pp. 261-264
Author(s):  
Teng Ge Mi ◽  
Ying Zhao ◽  
Chang Qing Dong ◽  
Wei Liang Cheng
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulation Rate ◽  
Gas Velocity ◽  
Solid Circulation Rate ◽  
Dual Fluidized Bed ◽  
Bed Material ◽  
Circulation Characteristics

In this paper, a dual fluidized bed has been established. The effect of bed material build-up height and gas velocity on the solid circulation rate of CFB (circulating fluidized bed) and BFB (bubble fluidized bed) has been studied. The results show that the solid circulation rate is increased with the increasing of gas velocity Uc and the bed material build-up height. Bed material build-up height of BFB and CFB is changed with the changing of gas velocity Uc. The bed material heights of CFB and BFB have been also investigated in this experiment.

Fluid-Dynamic Investigations in a Scaled Cold Model for a Dual Fluidized Bed Biomass Steam Gasification Process: Solid Flux Measurements and Optimization of the Cyclone

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Andreas Kreuzeder ◽  
Christoph Pfeifer ◽  
Hermann Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Separation Efficiency ◽  
Fluid Dynamic ◽  
Steam Gasification ◽  
Circulation Rate ◽  
Cold Model ◽  
Gasification Process ◽  
Dual Fluidized Bed ◽  
Bed Material

Gasification of biomass is an attractive technology for combined heat and power (CHP) production. A dual fluidized bed steam gasifier is in commercial operation at the biomass CHP plant in Guessing/Austria since 2002. For circulating fluidized bed applications the bed material consumption is economically crucial. Thus, cyclones for circulating fluidized beds need to be designed properly. Some erosion and caking in the cyclone of the gasifier could be observed with increasing hours of operation. The influences of these effects as well as the influence of the solid circulation rate between the two units on the separation efficiency were investigated by fluid-dynamic investigations using a scaled cold model. The results show that due to erosion and caking elutriation rates are increased, especially for smaller particles. However, the cyclone achieves fractional separation efficiencies of more than 99.9%.

Solid circulation rate in a circulating fluidized bed in the presence of fine powders

2006 ◽  
Vol 61 (2) ◽  
pp. 766-774 ◽  
Author(s):  
Emad Ahmed Mahmoud ◽  
Tsutomu Nakazato ◽  
Nobuyoshi Nakagawa ◽  
Kunio Kato
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulation Rate ◽  
Fine Powders ◽  
Solid Circulation Rate

scholarly journals Viscosity Effects on Solid Circulation Rate in a Liquid Solid Circulating Fluidized Bed

2014 ◽  
Vol 14 (10) ◽  
pp. 1037-1042 ◽  
Author(s):  
Nirmala Gnanasunda ◽  
Muruganandam Loganathan ◽  
Kumar Perumal
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulation Rate ◽  
Solid Circulation Rate ◽  
Viscosity Effects

Estimation of the solid circulation rate in circulating fluidized bed systems

2018 ◽  
Vol 336 ◽  
pp. 1-11 ◽  
Author(s):  
Michael Stollhof ◽  
Stefan Penthor ◽  
Karl Mayer ◽  
Hermann Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulation Rate ◽  
Solid Circulation Rate

scholarly journals Sensitivity Studies for Propane Oxidative Dehydrogenation to Propylene in Circulating Fluidized Bed

2006 ◽  
Vol 3 (1) ◽  
pp. 19 ◽  
Author(s):  
A.H. Fakeeha ◽  
M.A. Soliman ◽  
A.A. Ibrahim
Keyword(s):  
Fluidized Bed ◽  
Oxidative Dehydrogenation ◽  
Circulating Fluidized Bed ◽  
Circulation Rate ◽  
Propane Oxidative Dehydrogenation ◽  
Feed Composition ◽  
Solid Circulation Rate ◽  
Sensitivity Studies ◽  
Experimental Kinetics ◽  
Reactant Conversion

In this paper, simulation and sensitivity studies for propane oxidative dehydrogenation to which were propylene in a circulating fluidized bed is undertaken using a previously developed model. Various experimental kinetics, obtained by several investigators for the reaction using different catalysts, are employed in this study. A comparison is made for the performance of certain catalysts when used in a circulating fluidized bed reactor. The effects of changing reaction temperature, solid circulation rate, feed composition, pressure, and gas superficial velocity on reactant conversion and product selectivity and yields are studied. It was found that the catalyst prepared by Ramos et al. is superior to the others with respect to yield. 

Fluidized Bed Steam Gasification of Solid Biomass - Performance Characteristics of an 8 MWth Combined Heat and Power Plant

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Tobias Pröll ◽  
Reinhard Rauch ◽  
Christian Aichernig ◽  
Hermann Hofbauer
Keyword(s):  
Power Plant ◽  
Water Content ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Measurement Data ◽  
Combined Heat And Power ◽  
Steam Gasification ◽  
Plant Performance ◽  
Circulation Rate ◽  
Dual Fluidized Bed

The work focuses on a dual fluidized bed gasification technology that is successfully operated for combined heat and power production at a scale of 8 MWth in Guessing/Austria since 2002. The reactor concept consists of a circulating fluidized bed system with a steam-fluidized bubbling bed integrated into the solids return loop. Accompanying the operation of the commercial scale plant, parameter models have been developed and validated by comparison to measured data. As the models naturally fulfill mass and energy balances, the simulation also allows the validation of measurement data. The behaviour of the plant is studied by carrying out variations of selected parameters. Evaluation of different plant operation cases yields correlations between process variables. The solids circulation rate is shown versus riser exit velocity. Fuel water content and gasification temperature significantly influence global plant performance. Simulation predicts the efficiency of the existing power plant in optimized operation. Finally, part load behaviour is investigated and performance maps of the CHP plant are presented. High fuel water content at high gas engine load results in high gas velocities in the riser (erosion limit) and higher heat ratio in the produced energy. It is concluded that CHP-concepts based on fluidized bed steam gasification can reach high electric efficiencies and high overall fuel utilization rates even at small plant capacities of about 10 MWth.

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