scholarly journals Process Simulation of Steam Gasification of Torrefied Woodchips in a Bubbling Fluidized Bed Reactor Using Aspen Plus

2021 ◽  
Vol 11 (6) ◽  
pp. 2877
Author(s):  
Nhut M. Nguyen ◽  
Falah Alobaid ◽  
Bernd Epple
Keyword(s):  
Fluidized Bed ◽  
Conversion Efficiency ◽  
Process Model ◽  
Aspen Plus ◽  
Fluidized Bed Reactor ◽  
Steam Gasification ◽  
Operating Conditions ◽  
Carbon Conversion ◽  
Bubbling Fluidized Bed ◽  
Biomass Ratio

A comprehensive process model is proposed to simulate the steam gasification of biomass in a bubbling fluidized bed reactor using the Aspen Plus simulator. The reactor models are implemented using external FORTRAN codes for hydrodynamic and reaction kinetic calculations. Governing hydrodynamic equations and kinetic reaction rates for char gasification and water-gas shift reactions are obtained from experimental investigations and the literature. Experimental results at different operating conditions from steam gasification of torrefied biomass in a pilot-scale gasifier are used to validate the process model. Gasification temperature and steam-to-biomass ratio promote hydrogen production and improve process efficiencies. The steam-to-biomass ratio is directly proportional to an increase in the content of hydrogen and carbon monoxide, while gas yield and carbon conversion efficiency enhance significantly with increasing temperature. The model predictions are in good agreement with experimental data. The mean error of CO2 shows the highest value of 0.329 for the steam-to-biomass ratio and the lowest deviation is at 0.033 of carbon conversion efficiency, respectively. The validated model is capable of simulating biomass gasification under various operating conditions.

scholarly journals Effect of Operating Conditions on Catalytic Gasification of Bamboo in a Fluidized Bed

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Thanasit Wongsiriamnuay ◽  
Nattakarn Kannang ◽  
Nakorn Tippayawong
Keyword(s):  
Fluidized Bed ◽  
Conversion Efficiency ◽  
Steam Gasification ◽  
Operating Conditions ◽  
Carbon Conversion ◽  
Catalytic Gasification ◽  
Heating Value ◽  
Product Gas ◽  
Reactor Temperature ◽  
Tar Reforming

Catalytic gasification of bamboo in a laboratory-scale, fluidized bed reactor was investigated. Experiments were performed to determine the effects of reactor temperature (400, 500, and 600°C), gasifying medium (air and air/steam), and catalyst to biomass ratio (0 : 1, 1 : 1, and 1.5 : 1) on product gas composition, H2/CO ratio, carbon conversion efficiency, heating value, and tar conversion. From the results obtained, it was shown that at 400°C with air/steam gasification, maximum hydrogen content of 16.5% v/v, carbon conversion efficiency of 98.5%, and tar conversion of 80% were obtained. The presence of catalyst was found to promote the tar reforming reaction and resulted in improvement of heating value, carbon conversion efficiency, and gas yield due to increases in H2, CO, and CH4. The presence of steam and dolomite had an effect on the increasing of tar conversion.

Simulation of biomass gasification in bubbling fluidized bed reactor using aspen plus®

2021 ◽  
Vol 235 ◽  
pp. 113981
Author(s):  
M. Puig-Gamero ◽  
D.T. Pio ◽  
L.A.C. Tarelho ◽  
P. Sánchez ◽  
L. Sanchez-Silva
Keyword(s):  
Fluidized Bed ◽  
Aspen Plus ◽  
Fluidized Bed Reactor ◽  
Biomass Gasification ◽  
Bubbling Fluidized Bed

Kinetic Model of Steam Gasification of Biomass in a Bubbling Fluidized Bed Reactor

2017 ◽  
Vol 31 (2) ◽  
pp. 1702-1711 ◽  
Author(s):  
Bijan Hejazi ◽  
John R. Grace ◽  
Xiaotao Bi ◽  
Andrés Mahecha-Botero
Keyword(s):  
Kinetic Model ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Steam Gasification ◽  
Bubbling Fluidized Bed

Experimental Evaluation of Biomass Medium-Temperature Gasification with Rice Straw as the Fuel in a Bubbling Fluidized Bed Gasifier

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiaojia Wang ◽  
Zhenyu Zhong ◽  
Baosheng Jin
Keyword(s):  
Moisture Content ◽  
Fluidized Bed ◽  
Rice Straw ◽  
Operating Conditions ◽  
Raw Material ◽  
Carbon Conversion ◽  
Medium Temperature ◽  
Positive Effects ◽  
Bubbling Fluidized Bed ◽  
Gasification Efficiency

Abstract Our previous pilot-scale studies (Bioresource Technology 2018, 267: 102–109) preliminarily demonstrated the feasibility of performing air gasification with a novel two-stage system, including a medium-temperature bubbling fluidized bed (BFB) reactor and a high-temperature swirl-flow furnace reactor, using rice husk as the fuel. As an extension of that work, this study aims to further investigate the reaction mechanism and application prospect of this technology in the use of a more representative biomass fuel, i. e. rice straw. The operation stability, flow behaviors and reaction characteristics in the first-stage medium-temperature gasification reactor are studied in a lab-scale BFB gasifier. The effects of important operating conditions on the syngas quality, tar yield, compositions of carbon residue, and risk of agglomeration are elucidated in depth. The results have shown that an increase in the gasification temperature can promote syngas quality, gasification efficiency, and carbon conversion, but also increases the risk of agglomeration. An increase in the gasification equivalent ratio leads to positive effects on the syngas yield, carbon conversion, and tar concentration, but also has negative effects on the syngas heating value, tar yield, and especially the restrain of agglomeration. An increase in the raw material moisture content has negative influence on the gasification performance of rice straw, in terms of the gasification efficiency, carbon conversion, tar yield, and so on. However, the increase of moisture content can reduce the cost of raw material drying, and avoid the fluctuation of bed temperature, and therefore, a practical gasification system is recommended to be designed and operated under a certain conditions with moderate moisture contents.

Experimental study on steam gasification of torrefied woodchips in a bubbling fluidized bed reactor

Energy ◽  
2020 ◽  
Vol 202 ◽  
pp. 117744 ◽  
Author(s):  
Nhut M. Nguyen ◽  
Falah Alobaid ◽  
Jan May ◽  
Jens Peters ◽  
Bernd Epple
Keyword(s):  
Experimental Study ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Steam Gasification ◽  
Bubbling Fluidized Bed

Tar formation during eucalyptus gasification in a bubbling fluidized bed reactor: Effect of feedstock and reactor bed composition

2021 ◽  
Vol 229 ◽  
pp. 113749
Author(s):  
D.T. Pio ◽  
L.C.M. Ruivo ◽  
L.A.C. Tarelho ◽  
J.R. Frade ◽  
E. Kantarelis ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Bubbling Fluidized Bed

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.

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