Numerical investigations of biomass co-firing impacts on flame structure and emissions

Ngou Poi Poi , Linda and Nordin , Normayati Numerical investigations of biomass co-firing impacts on flame structure and emissions. In: National Advanced Materials and Manufacturing Engineering Conference (NAMME), 25-26 May 2010, Batu Pahat, Johor.

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Abstract

Fossil fuels have been used widely for power generation. Emphasis should be given to the usage of renewable energy for power generation to reduce our dependence on primary fossil fuels. The burning of biomass with fossil fuels has a positive impact, both on the environment and the economics of power generation. Both coal and biomass are chosen because they have great potential to be developed in future for power generation in Malaysia. The aim of this study is to investigate the impacts of burning biomass with coal on the pollutant emissions and combustion performances of this cofiring. Type of biomass used is sawdust and simulation is done using CFD code FLUENT software. A good understanding of the combustion and pollutant generating processes in the combustor helps to reduce emissions of pollutants and improve boiler performances. CFD simulation is first performed on the combustion of coal solely. The results of simulation obtained are then compared to the actual data taken from the Tanjung Bin power plant for validation purpose. Once the data validation has been achieved, second simulation can be performed on the same model for cofiring. The validation indicates that finer grid of meshing produces more accurate results with small error of 6.9% and 7.9% for the validation of temperature and radiation respectively. The results obtained from simulation indicate that cofiring does lower the emissions of CO2 significantly. This is shown by the concentration of CO2 that dropped drastically when coal was cofired with biomass. It is very important to reduce the amount of CO2 concentration in the air through the understanding of these gases formation as it would become a threat to the environment if the level is too high compared to other gases. A more intense combustion can also be achieved that can improve the combustion performance in terms of temperature and radiation. These parameters may indicate better combustion efficiency if the two fuels were burned together.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:cofiring;coal;biomass
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ807-830 Renewable energy sources
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
ID Code:4606
Deposited By:Mrs. Normayati Nordin
Deposited On:12 Dec 2013 14:25
Last Modified:12 Dec 2013 14:25

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