scholarly journals Steam Gasification of Lignite in a Bench-Scale Fluidized-Bed Gasifier Using Olivine as Bed Material

2020 ◽  
Vol 10 (8) ◽  
pp. 2931 ◽  
Author(s):  
Elisa Savuto ◽  
Jan May ◽  
Andrea Di Carlo ◽  
Katia Gallucci ◽  
Andrea Di Giuliano ◽  
...  

The gasification of lignite could be a promising sustainable alternative to combustion, because it causes reduced emissions and allows the production of syngas, which is a versatile gaseous fuel that can be used for cogeneration, Fischer-Tropsch synthesis, or the synthesis of other bio-fuels, such as methanol. For the safe and smooth exploitation of syngas, it is fundamental to have a high quality gas, with a high content of H2 and CO and minimum content of pollutants, such as particulate and tars. In this work, experimental tests on lignite gasification are carried out in a bench-scale fluidized-bed reactor with olivine as bed material, chosen for its catalytic properties that can enhance tar reduction. Some operating parameters were changed throughout the tests, in order to study their influence on the quality of the syngas produced, and pressure fluctuation signals were acquired to evaluate the fluidization quality and diagnose correlated sintering or the agglomeration of bed particles. The effect of temperature and small air injections in the freeboard were investigated and evaluated in terms of the conversion efficiencies, gas composition, and tar produced.

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
L. Vecchione ◽  
M. Moneti ◽  
S. Cocchi ◽  
M. Villarini ◽  
M. Sisinni ◽  
...  

Among Renewable Energy Sources (RES), biomass represent one of the most common and suitable solution in order to contribute to the global energy supply and to reduce greenhouse gases (GHG) emissions. The disposal of some residual biomass, as pruning from pine trees, represent a problem for agricultural and agro-industrial sectors. But if the residual biomass are used for energy production can become a resource. The most suitable energy conversion technology for the above-mentioned biomass is gasification process because the high C/N ratio and the low moisture content, obtained from the analysis. In this work a small-pilot bubbling-bed gasification plant has been designed, constructed and used in order to obtain, from the pine trees pruning, a syngas with low tar and char contents and high hydrogen content. The activities showed here are part of the activities carried out in the European 7FP UNIfHY project. In particular the aim of this work is to develop experimental test on a bench scale steam blown fluidized bed biomass gasifier. These tests will be utilized in future works for the simulations of a pilot scale steam fluidized bed gasifier (100 kWth) fed with different biomass feedstock. The results of the tests include produced gas and tar composition as well gas, tar and char yield. Tests on a bench scale reactor (8 cm I.D.) were carried out varying steam to biomass ratio from 0.5, 0.7 and 1 to 830°C.


2017 ◽  
Vol 31 (8) ◽  
pp. 8445-8453 ◽  
Author(s):  
J. Recari ◽  
C. Berrueco ◽  
S. Abelló ◽  
D. Montané ◽  
X. Farriol

2020 ◽  
Vol 114 ◽  
pp. 341-350 ◽  
Author(s):  
Elisa Savuto ◽  
Andrea Di Carlo ◽  
Katia Gallucci ◽  
Andrea Di Giuliano ◽  
Sergio Rapagnà

Fuel ◽  
2012 ◽  
Vol 95 ◽  
pp. 553-562 ◽  
Author(s):  
Friedrich Kirnbauer ◽  
Veronika Wilk ◽  
Hannes Kitzler ◽  
Stefan Kern ◽  
Hermann Hofbauer

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2006
Author(s):  
Diamantis Almpantis ◽  
Anastasia Zabaniotou

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.


Fuel ◽  
2013 ◽  
Vol 108 ◽  
pp. 1-12 ◽  
Author(s):  
Hong Cui ◽  
Scott Q. Turn ◽  
Vheissu Keffer ◽  
Donald Evans ◽  
Thai Tran ◽  
...  

Author(s):  
Anna Magdalena Mauerhofer ◽  
Florian Benedik ◽  
Johannes Christian Schmid ◽  
Hermann Hofbauer

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