Thermodynamic equilibrium model of pyroelectric polycrystalline thin films

2007 ◽  
Vol 90 (15) ◽  
pp. 152902 ◽  
Author(s):  
Wencheng Hu ◽  
Chuanren Yang ◽  
Wanli Zhang ◽  
Xiyi Liao
Keyword(s):  
Thin Films ◽  
Thermodynamic Equilibrium ◽  
Equilibrium Model ◽  
Polycrystalline Thin Films ◽  
Thermodynamic Equilibrium Model

A modified thermodynamic equilibrium model for woody biomass gasification

2013 ◽  
Vol 92 (4) ◽  
pp. 593-602 ◽  
Author(s):  
Pardis Rofouie ◽  
Maryam Moshkelani ◽  
Michel Perrier ◽  
Jean Paris
Keyword(s):  
Thermodynamic Equilibrium ◽  
Equilibrium Model ◽  
Woody Biomass ◽  
Biomass Gasification ◽  
Thermodynamic Equilibrium Model

Performance Prediction of Gasification of Biomass Briquettes Using Thermodynamic Equilibrium Model

2018 ◽  
Vol 2 (2) ◽  
pp. 71-76
Author(s):  
Chukwuemeka Jude Diji
Keyword(s):  
Rice Husk ◽  
Thermodynamic Equilibrium ◽  
Equilibrium Model ◽  
Clean Energy ◽  
Fuel Ratio ◽  
Product Gas ◽  
Biomass Resources ◽  
Groundnut Shell ◽  
Combustible Gases ◽  
Thermodynamic Equilibrium Model

The gasification of biomass resources is considered a promising route for the production of clean energy fuels for the future.The product gas of partial combustion of biomass with air as the gasifying medium is the mixture of CO, H2, CH4, CO2, H2Oand N2 called syngas. Syngas generation is now considered matured and acceptable technology compared to other biomassconversion technologies. In this study, a thermodynamic equilibrium model to determine syngas composition based on carbon,hydrogen and oxygen obtained from composite agricultural wastes was developed. For these materials, at preset gasificationtemperature of 750oC, the effects of changes in moisture content and air/fuel ratio on the quality syngas composition weremodeled. The yields of combustible gases (H2, CO and CH4) from Rice husk briquette were observed to be generally higherthan those of groundnut shell with sawdust briquette. The result with Groundnut shell and Sawdust briquette as input indicatedthat the fraction of H2, CO and CH4 gradually decreased, while the concentration of CO2 and H2O increased when moisturecontent increases from 0% to 45%. Similar trend was observed from the analysis of Rice husk briquette gasification in the model.The amount of Air per kmol of fuel varied from 0 to 1.0. As a result, the H2, CO and CH4 content of syngas for Groundnutshell and sawdust briquette decreased continuously; with CH4 approaching zero at air/fuel ratio of unity. Similar trend occurredin Rice husk briquette, but the values were higher than those observed for the groundnut shell & sawdust briquette. The amountof CO2 and H2O increased from 14.9742% and 20.6603% to 36.5886% and 57.3208% respectively for Groundnut shell briquette,while for Rice husk briquette the amount of CO2 and H2O rose from initial values of 2.8047% and 2.2552% at zero air/fuelratios to 40.3272% and 45.6339% respectively.The results of this study would be useful for the engineering development of biomass gasification power generation technologiesand in the selection of appropriate feedstock.

scholarly journals Analysis of Hydrogen Generation through Thermochemical Gasification of Coconut Shell Using Thermodynamic Equilibrium Model Considering Char and Tar

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Shanmughom Rupesh ◽  
Chandrasekharan Muraleedharan ◽  
Palatel Arun
Keyword(s):  
Thermodynamic Equilibrium ◽  
Equilibrium Model ◽  
Equivalence Ratio ◽  
Equilibrium Constants ◽  
Steam Gasification ◽  
Coconut Shell ◽  
Heating Value ◽  
Product Gas ◽  
Biomass Ratio ◽  
Thermodynamic Equilibrium Model

This work investigates the potential of coconut shell for air-steam gasification using thermodynamic equilibrium model. A thermodynamic equilibrium model considering tar and realistic char conversion was developed using MATLAB software to predict the product gas composition. After comparing it with experimental results the prediction capability of the model is enhanced by multiplying equilibrium constants with suitable coefficients. The modified model is used to study the effect of key process parameters like temperature, steam to biomass ratio, and equivalence ratio on product gas yield, composition, and heating value of syngas along with gasification efficiency. For a steam to biomass ratio of unity, the maximum mole fraction of hydrogen in the product gas is found to be 36.14% with a lower heating value of 7.49 MJ/Nm3 at a gasification temperature of 1500 K and equivalence ratio of 0.15.

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