Novel Technologies for Energy Saving and Carbon Reduction of Water Emulsified Fuel and Carbon Containing Fly Ashes

• Main Authors: Chun-Chi Chen, 陳俊吉
• Other Authors: Wen-Jhy Lee
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/83037350997422640178

博士 === 國立成功大學 === 環境工程學系碩博士班 === 97 === Decreasing the use of petroleum and coal are important environmental issues in reduction of CO2 emissions and consumption of fossil fuels. This study develops two related technologies, water emulsified fuel and carbon containing fly ashes. The aims of this study are as follows: First, this study uses wastewater and water to make the emulsified oil to evaluate energy efficiencies and flue gase pollutant emissions of industrial boilers. Second, this study applies bio-catalyst (NOE-7F) in the thermal treatment of waste-tire combustion ashes. The mechanism and efficiency of reducing the carbon content, after addition of the bio-catalyst are discussed. The results of the first part of reserch are as follows: better emulsion stability is found in wastewater emulsified oil as compared to water emulsified oil. Moreover, water/oil droplets are relatively uniform and smaller in wastewater emulsified fuel, and thus provide better combustion efficiency in boilers than heavy oil fuels, providing an energy saving of about 13%, as well as facilitating safe disposal of industrial wastewater. Furthermore, the wastewater emulsified oil fuel results in significant reductions in CO2 (13%), CO (84%), NOx (17%), particulate matter (36%), SO2 (13%), and total-PAHs (36%), and total-BaPeq (47%), as compared to heavy oil fuel. Considering the annual fuel consumption of 15 Mm3 in Taiwan with the fuel cost (NT $10,000 per m3), the potential overall fuel saving of such an approach is NT $15 billion. The results of the second part of reserch are as follows: The color of raw fly ashes was dark black and thermal treatment with NOE-7F made this change to white. The use of NOE-7F could improve the combustion efficiency of carbon content during thermal treatment. After thermal treatment of fly ashes by adding 10% NOE-7F, the carbon contents reduced by 37.6% (E10) and IHC increased by 45.7%. Moreover, with the significant carbon reduction due to adding NOE-7F, the compressive strength of mixture concrete of the fly ashes increased by 7%. Using NOE-7F may thus reduce the amount of fly ashes in landfill and the related decrease treatment costs. The results indicate that NOE-7F has a catalytic effect on combustion and enhances the energy released. Adding NOE-7F in the co-combustion of waste tires and coal can be further investigated in commercial boiler for energy saving and pollution reduction, and thus NOE-7F may play an important role in coal power plant for energy saving in the future.