scholarly journals Integrated catalytic adsorption steam gasification in a bubbling fluidized bed for enhanced H2 production: perspective of design and pilot plant experiences

2018 ◽  
Vol 12 (5) ◽  
pp. 735-748 ◽  
Author(s):  
Zakir Khan ◽  
Suzana Yusup ◽  
Murni M Ahmad ◽  
Abrar Inayat ◽  
Muhammad Naqvi ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Pilot Plant ◽  
H2 Production ◽  
Steam Gasification ◽  
Bubbling Fluidized Bed

Biomass steam gasification in bubbling fluidized bed for higher-H2 syngas: CFD simulation with coarse grain model

2019 ◽  
Vol 44 (13) ◽  
pp. 6448-6460 ◽  
Author(s):  
Tian Qi ◽  
Tingzhou Lei ◽  
Beibei Yan ◽  
Guanyi Chen ◽  
Zhongshan Li ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Cfd Simulation ◽  
Steam Gasification ◽  
Coarse Grain ◽  
Bubbling Fluidized Bed ◽  
Grain Model

scholarly journals CO2 gasification of biogenic fuels in a dual fluidized bed reactor system

2019 ◽  
Author(s):  
Anna Magdalena Mauerhofer ◽  
Stefan Müller ◽  
Florian Benedikt ◽  
Josef Fuchs ◽  
Alexander Bartik ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Pilot Plant ◽  
Alkali Metals ◽  
Alternative Fuels ◽  
Steam Gasification ◽  
Biomass Ash ◽  
Gasification Process ◽  
Product Gas ◽  
Dual Fluidized Bed ◽  
Shift Reaction

Abstract A 100 kWth dual fluidized bed steam gasification pilot plant has been developed at TU Wien to convert different types of biogenic fuels into a valuable product gas. In this paper, the conversion of different biogenic fuels in combination with the utilization of CO2 as alternative gasification agent was investigated in the mentioned pilot plant. For this purpose, five experimental campaigns were carried out aiming at the investigation of softwood as reference fuel, and rapeseed cake, bark and lignin as alternative fuels. Pure olivine as well as a mixture (90/10 wt%) of olivine and limestone were used as bed materials. The product gas compositions of the different biogenic fuels changed depending on the elemental composition of the biogenic fuels. Thus, a high amount of carbon in the fuel enhanced CO formation, whereas an increased content of oxygen led to higher CO2 contents. Additionally, the presence of alkali metals in the biomass ash favoured the production of CO. The addition of limestone enhanced the H2 and CO contents via the water gas shift reaction as well as steam and dry reforming reactions, but had no significant effect on tar contents. Overall, this paper presents the feasibility of the dual-fluidized bed gasification process of different biogenic fuels with CO2 as gasification agent.

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

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.

Steam Gasification of Woody Biomass in a Circulating Dual Bubbling Fluidized Bed System

2008 ◽  
Vol 22 (3) ◽  
pp. 1980-1985 ◽  
Author(s):  
Koichi Matsuoka ◽  
Koji Kuramoto ◽  
Takahiro Murakami ◽  
Yoshizo Suzuki
Keyword(s):  
Fluidized Bed ◽  
Woody Biomass ◽  
Steam Gasification ◽  
Bubbling Fluidized Bed

Retrofit of a Bubbling Fluidized Bed Pilot Plant From Air Combustion to Oxyfuel Combustion

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Gabriel M. Faé Gomes ◽  
Antônio C. F. Vilela ◽  
Guilherme P. da Silva Priebe ◽  
Leandro Dalla Zen
Keyword(s):  
Fluidized Bed ◽  
Process Parameters ◽  
Pilot Plant ◽  
Combustion Process ◽  
Air Leakage ◽  
Radiation Mechanism ◽  
Oxyfuel Combustion ◽  
Bubbling Fluidized Bed ◽  
And Control ◽  
Energy Balances

When using fluidized bed in oxyfuel combustion, process parameters must be adjusted to maintain combustion and control air leakage into the system as there are important changes in gases properties, flow, and temperature. In this sense, this work makes a description of the retrofit of air combustion to oxyfuel combustion in a 0.25 MWth bubbling fluidized pilot plant. Process parameters were analyzed and mass and energy balances were developed to compare air and oxyfuel combustion. Air leakage and fluidization showed to be important to control when proceeding transition to oxyfuel combustion and temperature increase was consequence of radiation mechanism changes.

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