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.

scholarly journals Hydrogen rich product gas from air-steam gasification of Indian biomasses with waste engine oil as binder

2021 ◽  
Author(s):  
Prashant Sharma ◽  
Bhupendra Gupta ◽  
Mukesh Pandey
Keyword(s):  
Equivalence Ratio ◽  
Calorific Value ◽  
Steam Gasification ◽  
Engine Oil ◽  
Small Scale ◽  
Hydrogen Yield ◽  
Syngas Production ◽  
Waste Engine Oil ◽  
Product Gas ◽  
Biomass Ratio

Abstract Present study concerns with the production of H2 rich product gas by thermochemical energy conversion having biomass gasification as a route for the four biomasses i.e., Kasai Saw Dust, Lemon Grass, Wheat Straw and Pigeon Pea Seed Coat. The biomasses are from the family of woody biomass, grasses, agricultural waste and food process industry wastes. Waste engine oil as an additive is used, which also acts as a binder. Air gasification and Air-steam gasification is applied and compared for product gas composition, hydrogen yield and other performance parameters like lower heating value, energy yield. Product gas constituents, hydrogen production is examined with different steam to biomass ratio (S/B ratio) and equivalence ratio. The equivalence ratio varies from 0.20–0.40 and the steam to biomass ratio varies between 0–4. The waster engine oil is mixed with the biomasses with different percentage of 5 and 10 wt%. For enhancement of feedstock quality palletization process is applied. The H2 yield is greatly affected by the equivalence ratio. Results show maximum H2 production and higher calorific value of product gas at an air to fuel of 0.26 for all the biomass pallets. Also, the S/B ratio observed as important aspect for hydrogen enrichment. Hydrogen yield is maximum at 2.4 steam to biomass ratio. This study considers the rarely studied Indian biomasses with waste engine oil as an additive for hydrogen-rich product gas production and will be beneficial for small scale hydrogen-rich syngas production considering the central Indian region originated biomasses. Statement of Novelty (SON): Research work belongs to eco-friendly use of rarely studied Indian biomass pallets. Equivalence air to fuel ratio (E/R ratio), steam to biomass ratio (S/B ratio) and waste engine oil as additive have been considered to upgrade H2 content and Calorific Value (CV) of the product gas. Novelty of work include use of waste engine oil as additive to make biomass pallets.

scholarly journals Parametric Study on the Heating Values of Products as via Steam Gasification of Palm Waste Using CaO as Sorbent Material

2016 ◽  
Vol 1133 ◽  
pp. 654-658 ◽  
Author(s):  
Abrar Inayat ◽  
Murni Melati Ahmad ◽  
Mohamed Ibrahim Abdul Mutalib ◽  
Suzana Yusup ◽  
Zakir Khan
Keyword(s):  
Hydrogen Production ◽  
Steam Gasification ◽  
Published Data ◽  
Heating Value ◽  
Syngas Production ◽  
Sorbent Material ◽  
Product Gas ◽  
Biomass Ratio ◽  
Lower Temperature ◽  
Palm Waste

In Malaysia, due to abundance of oil palm waste, it is a good candidate to be used as a feedstock for syngas and hydrogen production. Biomass steam gasification is one of the promising methods for syngas production. This work focuses on the steam gasification with in-situ CO2 capture using CaO as absorbent materials for hydrogen production from palm oil empty fruit bunch (EFB). Three parameters (temperature, steam/biomass ratio and sorbent/biomass ratio) has been studied on the lower heating value (LHV) and higher heating value (HHV) of product gas. The results shows that the current study gives higher value of LHV at lower temperature of 823K. The higher value of LHV is obtained due to the lower concentration of CO2 caused by using CaO as sorbent material. Furthermore, CaO materials enhanced the concentration of concentration of the CO, H2 and CH4 in the product gas. The results are also compared against published data as well.

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.

Performance Prediction of Gasification of Biomass Briquettes Using Thermodynamic Equilibrium Model

2018 ◽  
Vol 2 (2) ◽  
pp. 71-76
Author(s):  
C. J. Diji, T. O. Popoola
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.

Gasification of Municipal Solid Waste: Thermodynamic Equilibrium Analysis Using Gibbs Energy Minimization Method and CFD Simulation of a Downdraft Gasifier

2020 ◽  
Vol 46 (3) ◽  
pp. 274-288 ◽  
Author(s):  
Syed Shabbar Raza ◽  
Sherien Elagroudy ◽  
Isam Janajreh
Keyword(s):  
Gibbs Energy ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Thermodynamic Equilibrium ◽  
Equilibrium Model ◽  
Energy Minimization ◽  
Steam Gasification ◽  
Minimization Method ◽  
Thermodynamic Equilibrium Model ◽  
Energy Minimization Method

Millions of tons of municipal solid waste (MSW) are generated annually, posing dramatic threats to our environment. To reduce its environmental impact, MSW can be segregated and thermochemically converted into clean syngas (CO and H2) fuel via gasification process. The feasibility of Gasification of MSW depends on its composition and quantity. In this work, assessment of the gasification metric of MSW is conducted under steam (H2O) as gasification moderator in a pilot scale 20kW gasifier. The characteristic of local MSW are experimentally determined using Flash 2000 organic analyzer (CHNS-O), the thermo-gravimetric analyzer (TGA) and bomb calorimeter following ASTM standards and arriving to molar formula of MSW. A thermodynamic equilibrium model based on Gibbs energy minimization method is used for the steam gasification of MSW to assess the composition of syngas. Using the baseline operating condition from the thermodynamic equilibrium model, a reactive high fidelity numerical model of a downdraft gasifier is developed to gain more fidelity. Result of gasification efficiency of thermodynamic model is 64% while reactive model gives 7% additional efficiency. Nonetheless, the stipulated efficiency and the high-quality syngas produced via the steam gasification of MSW suggest the viability of the process scale up.

Sign in / Sign up

Export Citation Format

Share Document