scholarly journals Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

Energies ◽  
2016 ◽  
Vol 9 (7) ◽  
pp. 504 ◽  
Author(s):  
Mazda Biglari ◽  
Hui Liu ◽  
Ali Elkamel ◽  
Ali Lohi
Keyword(s):  
Fluidized Bed ◽  
Scaling Law ◽  
Cfd Modeling ◽  
Fluidized Bed Gasifier

scholarly journals Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

2021 ◽  
Author(s):  
Mazda Biglari ◽  
Hui Liu ◽  
Ali Elkamel ◽  
Ali Lohi
Keyword(s):  
Fluidized Bed ◽  
Particle System ◽  
Scaling Law ◽  
Computational Cost ◽  
Cfd Modeling ◽  
Hydrodynamic Characteristics ◽  
Small Scale ◽  
Small Column ◽  
Cfd Models ◽  
Fluidized Bed Gasifier

Two modeling approaches, the scaling-law and CFD (Computational Fluid Dynamics) approaches, are presented in this paper. To save on experimental cost of the pilot plant, the scaling-law approach as a low-computational-cost method was adopted and a small scale column operating under ambient temperature and pressure was built. A series of laboratory tests and computer simulations were carried out to evaluate the hydrodynamic characteristics of a pilot fluidized-bed biomass gasifier. In the small scale column solids were fluidized. The pressure and other hydrodynamic properties were monitored for the validation of the scaling-law application. In addition to the scaling-law modeling method, the CFD approach was presented to simulate the gas-particle system in the small column. 2D CFD models were developed to simulate the hydrodynamic regime. The simulation results were validated with the experimental data from the small column. It was proved that the CFD model was able to accurately predict the hydrodynamics of the small column. The outcomes of this research present both the scaling law with the lower computational cost and the CFD modeling as a more robust method to suit various needs for the design of fluidized-bed gasifiers.

scholarly journals Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

2021 ◽  
Author(s):  
Mazda Biglari ◽  
Hui Liu ◽  
Ali Elkamel ◽  
Ali Lohi
Keyword(s):  
Fluidized Bed ◽  
Particle System ◽  
Scaling Law ◽  
Computational Cost ◽  
Cfd Modeling ◽  
Hydrodynamic Characteristics ◽  
Small Scale ◽  
Small Column ◽  
Cfd Models ◽  
Fluidized Bed Gasifier

Two modeling approaches, the scaling-law and CFD (Computational Fluid Dynamics) approaches, are presented in this paper. To save on experimental cost of the pilot plant, the scaling-law approach as a low-computational-cost method was adopted and a small scale column operating under ambient temperature and pressure was built. A series of laboratory tests and computer simulations were carried out to evaluate the hydrodynamic characteristics of a pilot fluidized-bed biomass gasifier. In the small scale column solids were fluidized. The pressure and other hydrodynamic properties were monitored for the validation of the scaling-law application. In addition to the scaling-law modeling method, the CFD approach was presented to simulate the gas-particle system in the small column. 2D CFD models were developed to simulate the hydrodynamic regime. The simulation results were validated with the experimental data from the small column. It was proved that the CFD model was able to accurately predict the hydrodynamics of the small column. The outcomes of this research present both the scaling law with the lower computational cost and the CFD modeling as a more robust method to suit various needs for the design of fluidized-bed gasifiers.

scholarly journals Gasification Characteristics of Lignite in a Fluidized Bed Gasifier

2021 ◽  
Vol 784 (1) ◽  
pp. 012033
Author(s):  
Xuefeng Li ◽  
Zhenhua Yan ◽  
Qingping Zhang ◽  
Bo Gao ◽  
Hao Chen ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Gasifier

scholarly journals Mitigating bed agglomeration in a fluidized bed gasifier operating on rice straw

2020 ◽  
Vol 6 ◽  
pp. 275-285
Author(s):  
Jurarat Nisamaneenate ◽  
Duangduen Atong ◽  
Anun Seemen ◽  
Viboon Sricharoenchaikul
Keyword(s):  
Fluidized Bed ◽  
Rice Straw ◽  
Fluidized Bed Gasifier ◽  
Bed Agglomeration

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

scholarly journals Technological Solutions and Tools for Circular Bioeconomy in Low-Carbon Transition: Simulation Modeling of Rice Husks Gasification for CHP by Aspen PLUS V9 and Feasibility Study by Aspen Process Economic Analyzer

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2006
Author(s):  
Diamantis Almpantis ◽  
Anastasia Zabaniotou
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Aspen Plus ◽  
Economic Assessment ◽  
Product Yield ◽  
Steam Gasification ◽  
Low Carbon ◽  
Simulation Tools ◽  
Fluidized Bed Gasifier ◽  
Annual Earnings

This study explored the suitability of simulation tools for accurately predicting fluidized bed gasification in various scenarios without disturbing the operational system, and dedicating time to experimentation, in the aim of benefiting the decision makers and investors of the low-carbon waste-based bioenergy sector, in accelerating circular bioeconomy solutions. More specifically, this study aimed to offer a customized circular bioeconomy solution for a rice processing residue. The objectives were the simulation and economic assessment of an air atmospheric fluidized bed gasification system fueled with rice husk, for combined heat and power generation, by using the tools of Aspen Plus V9, and the Aspen Process Economic Analyzer. The simulation model was based on the Gibbs energy minimization concept. The technological configurations of the SMARt-CHP technology were used. A parametric study was conducted to understand the influence of process variables on product yield, while three different scenarios were compared: (1) air gasification; (2) steam gasification; and (3) oxygen-steam gasification-based scenario. Simulated results show good accuracy for the prediction of H2 in syngas from air gasification, but not for the other gas components, especially regarding CO and CH4 content. It seems that the RGIBBS and Gibbs free minimization concept is far from simulating the operation of a fluidized bed gasifier. The air gasification scenario for a capacity of 25.000 t/y rice husk was assessed for its economic viability. The economic assessment resulted in net annual earnings of EUR 5.1 million and a positive annual revenue of EUR 168/(t/y), an excellent pay out time (POT = 0.21) and return of investment (ROI = 2.8). The results are dependent on the choices and assumptions made.

Prediction of CO2 gasification rate of char in fluidized bed gasifier

Fuel ◽  
1986 ◽  
Vol 65 (12) ◽  
pp. 1688-1693 ◽  
Author(s):  
Tadafumi Adschiri ◽  
Tohru Shiraha ◽  
Toshinori Kojima ◽  
Takehiko Furusawa
Keyword(s):  
Fluidized Bed ◽  
Co2 Gasification ◽  
Gasification Rate ◽  
Fluidized Bed Gasifier
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