Steam Gasification of Biomass Coupled with Lime-Based CO2 Capture in a Dual Fluidized Bed: A Modeling Study

Biomass is an important renewable energy and making hydrogen-rich syngas from biomass is promising. Dual fluidized bed gasification technology can increase hydrogen content in the syngas. Moreover, steam gasification of biomass coupled with lime-based CO2 capture in a dual fluidized bed can further improve the syngas quality . This paper established a dual fluidized bed gasification model using Aspen plus,in order to explore the effect of different gasification temperatures and steam to biomass ratios on hydrogen content in syngas, providing a theoretical basis for the optimization of operating parameters and process.

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Steam gasification of biomass coupled with lime-based CO2 capture in a dual fluidized bed reactor: A modeling study

Fuel ◽

10.1016/j.fuel.2013.07.083 ◽

2014 ◽

Vol 117 ◽

pp. 1256-1266 ◽

Cited By ~ 28

Author(s):

Bijan Hejazi ◽

John R. Grace ◽

Xiaotao Bi ◽

Andrés Mahecha-Botero

Keyword(s):

Fluidized Bed ◽

Co2 Capture ◽

Fluidized Bed Reactor ◽

Steam Gasification ◽

Dual Fluidized Bed ◽

Modeling Study

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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 ◽

10.3390/en14072006 ◽

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.

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