Modeling, simulation and optimization of downdraft gasifier: Studies on chemical kinetics and operating conditions on the performance of the biomass gasification process

Energy ◽  
2016 ◽  
Vol 116 ◽  
pp. 1065-1076 ◽  
Author(s):  
Ashish Chaurasia
Keyword(s):  
Chemical Kinetics ◽  
Biomass Gasification ◽  
Operating Conditions ◽  
Simulation And Optimization ◽  
Downdraft Gasifier ◽  
Modeling Simulation ◽  
Gasification Process

AN OVERVIEW OF HYDROGEN FUEL FROM BIOMASS GASIFICATION - COST EFFECTIVE ENERGY FOR DEVELOPING ECONOMY

2021 ◽  
Vol 36 (1) ◽  
pp. 42-52
Author(s):  
F. N Osuolale ◽  
K. A. Babatunde ◽  
O.O Agbede ◽  
A. F Olawuni ◽  
A.J Fatukasi ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Cost Effective ◽  
Biomass Gasification ◽  
Operating Conditions ◽  
Thermochemical Conversion ◽  
Gasification Process ◽  
Product Gas ◽  
Economic Process ◽  
Percentage Yield ◽  
Different Sources

Hydrogen has the potential to be a clean and sustainable alternative to fossil fuel especially if it is produced from renewable sources such as biomass. Gasification is the thermochemical conversion of biomass to a mixture of gases including hydrogen. The percentage yield of each constituent of the mixture is a function of some factors. This article highlights various parameters such as operating conditions; gasifier type; biomass type and composition; and gasification agents that influence the yield of hydrogen in the product gas. Economic evaluation of hydrogen from different sources was also presented. The hydrogen production from gasification process appears to be the most economic process amongst other hydrogen production processes considered. The process has the potential to be developed as an alternative to the conventional hydrogen production process.

scholarly journals Biomass Gasification Process with Catalyst

2020 ◽  
Vol 06 (09) ◽  
pp. 38-53
Author(s):  
H Musfer
Keyword(s):  
Power Generation ◽  
Chemical Process ◽  
Biomass Gasification ◽  
Operating Conditions ◽  
Low Energy ◽  
Fuel Gas ◽  
Heavy Hydrocarbons ◽  
Gasification Process ◽  
Endothermic Reactions ◽  
Secondary Cracking

Gasification is a thermo-chemical process used to convert biomass fuelsinto a fuel gas. Biomass gasification is considered amongst the best methods to enhance biomass-based energy production’s efficiency as it allows common biomass utilization.It has become more important as a mean of converting low energy-density such as biomass feeds or into a transportable high value gas for heat and power generation, chemicals and fuels. Operating conditions are affecting the gasification reactions. the review identified that in high-temperature gasification, endothermic reactions the secondary cracking and reforming of heavy hydrocarbons are favored and hence enhances the whole process’s efficiency. Finally, catalysts are vital for the biomass gasification process, and it is important to select the appropriate ones taking into consideration possible setbacks discussed above and will be explored further in this study.

scholarly journals The Effect of Moisture Content on the Tar Characteristic of Wood Pellet Feedstock in a Downdraft Gasifier

2020 ◽  
Vol 10 (8) ◽  
pp. 2760
Author(s):  
Rizqi Fitri Naryanto ◽  
Hiroshi Enomoto ◽  
Anh Vo Cong ◽  
Kazuki Fukadu ◽  
Zheng Zong ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Moisture Content ◽  
Total Concentration ◽  
Biomass Gasification ◽  
Gas Chromatography Mass Spectrometry ◽  
Gravimetric Analysis ◽  
Wood Pellets ◽  
Wood Pellet ◽  
Downdraft Gasifier ◽  
Gasification Process

This study examined the tar characteristic of wood pellet using a downdraft gasifier system. The wood pellet was used as a feedstock with a variation of moisture content between 2 to 6 wt. %. Tar sample was taken using the JP 2009-40885 method. Gas chromatography mass spectrometry and gravimetric analysis were used to identify and to analyze the tar sample, respectively. The results show that an increase in moisture content slightly decreased the total concentration of tar formation on the nine tar compounds of the biomass. Additionally, the lowest moisture content produced the highest amount of light tar on tar classification. The amount of light tar indicates the ease of ignition in the gasifier. Therefore, this condition will minimize the failure-of-equipment problem because of no clogs in the gasifier equipment. The lowest moisture content had the lowest tar density, and this minimized the deposit of tar in the gasifier. Therefore, the lowest moisture content had low tar production in the biomass gasification process using wood pellets.

Biomass gasification in a downdraft gasifier with a two-stage air supply: Effect of operating conditions on gas quality

2014 ◽  
Vol 61 ◽  
pp. 236-244 ◽  
Author(s):  
Ana Lisbeth Galindo ◽  
Electo Silva Lora ◽  
Rubenildo Viera Andrade ◽  
Sandra Yamile Giraldo ◽  
Rene Lesme Jaén ◽  
...  
Keyword(s):  
Biomass Gasification ◽  
Operating Conditions ◽  
Two Stage ◽  
Downdraft Gasifier ◽  
Supply Effect ◽  
Air Supply

Downdraft gasifier design calculation for biomass gasification using exhaust gas as a gasification agent

2021 ◽  
Author(s):  
Sherif Elshokary ◽  
Sherif Farag ◽  
OSayed Sayed Mohamed Abu-Elyazeed ◽  
Bitu Hurisso ◽  
Mostafa Ismai
Keyword(s):  
Biomass Gasification ◽  
Design Calculation ◽  
Exhaust Gas ◽  
Downdraft Gasifier

scholarly journals Simulation of a Downdraft Gasifier for Production of Syngas from Different Biomass Feedstocks

2021 ◽  
Vol 5 (2) ◽  
pp. 20
Author(s):  
Mateus Paiva ◽  
Admilson Vieira ◽  
Helder T. Gomes ◽  
Paulo Brito
Keyword(s):  
Modeling And Simulation ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Fuel Gas ◽  
Heating Value ◽  
Downdraft Gasifier ◽  
Process Operation ◽  
Independent Parameters ◽  
Gasification Temperature ◽  
Main Operating

In the evaluation of gasification processes, estimating the composition of the fuel gas for different conditions is fundamental to identify the best operating conditions. In this way, modeling and simulation of gasification provide an analysis of the process performance, allowing for resource and time savings in pilot-scale process operation, as it predicts the behavior and analyzes the effects of different variables on the process. Thus, the focus of this work was the modeling and simulation of biomass gasification processes using the UniSim Design chemical process software, in order to satisfactorily reproduce the operation behavior of a downdraft gasifier. The study was performed for two residual biomasses (forest and agricultural) in order to predict the produced syngas composition. The reactors simulated gasification by minimizing the free energy of Gibbs. The main operating parameters considered were the equivalence ratio (ER), steam to biomass ratio (SBR), and gasification temperature (independent variables). In the simulations, a sensitivity analysis was carried out, where the effects of these parameters on the composition of syngas, flow of syngas, and heating value (dependent variables) were studied, in order to maximize these three variables in the process with the choice of the best parameters of operation. The model is able to predict the performance of the gasifier and it is qualified to analyze the behavior of the independent parameters in the gasification results. With a temperature between 850 and 950 °C, SBR up to 0.2, and ER between 0.3 and 0.5, the best operating conditions are obtained for maximizing the composition of the syngas in CO and H2.

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