CFD simulation of downdraft gasification

Name: Charissa Ruth Enget

LCSH: Kasetsart University -- Theses. M.Eng. (Mechanical and energy Engineering) 2019

Classification :.LCCS: TP339

LCSH: Kasetsart University. -- Department of Mechanical Engineering -- Theses

LCSH: Biomass gasification

LCSH: Biomass energy

LCSH: Computational fluid dynamics

Abstract: As the scarcity of oil increases, its prices continue to rise. To battle rising costs, interest in renewable energy sources increases each year to find an alternative to oil and natural gas to power the world. Biomass currently accounts for around 10% of the world’s energy consumption each year. Gasification is currently the best technology for natural energy conversion due to its versatility and its use as a carbon neutral energy source. Downdraft gasifiers can generate biogas which can be used with internal combustion engines and other thermal applications. However, downdraft gasifiers’ main issues are their comparatively low heating value and tar content in their producer gas. Mathematical and CFD modeling are useful tools in optimizing the gasification process. Currently, a mathematical model does not exist which simulates the gasification and combustion of solid fuel. This study aims to progress toward a solution. The CFD simulation of a downdraft gasifier with two air inlets as oxidizers and eucalyptus wood chips as fuel was performed to produce a temperature, velocity, and pressure profile of the gasifier. This temperature profile and biomass feedstock was used as an input to a MATLAB mathematical model which used the Newton-Raphson method to predict the producer gas composition of this downdraft gasifier. The results from this study are useful for determining appropriate blower sizing, optimizing producer gas composition, determining sufficient amount of air nozzles for even combustion in gasifier design, observing the effects of feedstock shape and size on combustion and the gasification agent velocity profile, and predicting the pressure drop.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Kitipong Jaojaruek

Role: Thesis Advisor

Created: 2019

Modified: 2025-08-03

Issued: 2025-08-03

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2562/charissa-rut-all.pdf

CallNumber: TP339 .C43

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Mechanical and energy Engineering

Grantor: Kasetsart University

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