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The study of incineration pollutants in flue gas
|關鍵字:||incineration;焚化;pollutants;heavy metal;acid gas;organic;simulation;thermodynamic equilibrium model;ASPEN PLUS;污染物;重金屬;酸性氣體;有機物;模擬;熱力平衡模式||出版社:||環境工程學系||摘要:||
Incineration is one of the best disposal technology for municipal waste. It has the advantages of volume reduction and high toxicity reduction. The heat energy produced during the incineration could be also recovered for electric generation. However, inadequate design or operation could result in the emission of pollutants. The composition of waste is very complex. Many types of pollutants could be produced during incineration. The pollutants contain heavy metals, acid gas, and toxic organic compounds, which pose a grave threat to human health. Heavy metal compounds will react with oxygen or chlorine to from metal oxides or metal chlorides. The elements of chlorine, sulfur, and nitrogen contained in the waste or fuel will react with hydrogen or oxygen to generate acid gas, such as hydrogen chloride, vitriol, and aquafortis. The formation of these acid gas could be related to the operating temperature, waste composition, and the air pollution control devices. The toxic organic compounds include the volatile organic such as benzene, toluene, carbon tetrachloride, chloroform, and the semi volatile organic such as phenol. The emission of dioxin and fluorene also cause intensive public concern. Therefore, it is imperative to identify the pollutants generated from incineration.
However the generation of pollutants and the relations between these pollutants under various incineration conditions were rarely studied. The study of the pollutants generated from incineration was then performed by applying ASPEN PLUS and thermodynamic equilibrium model. At the same time, the experiments were carried out to evaluate the potential pollutants emissed from the incineration of simulated municipal waste. The reactor for this experiment was an pilot scale fluid bed incinerator. The composition of municipal solid waste was modelled by factitiousness in which Cd, Pb and Cr regulated by law were selected as heavy metal substances. The operating conditions included the temperature of first combustion chamber, the temperature of secondary combustion chamber and the species of chlorides content. And the SO2, NOx, HCl, PAHs, BTEX, particulate and heavy metal compounds were the pollutants to be studied.
The results obtained from present works, provide the information for understanding the pollutants emissed from the incineration and the relations between these pollutants under various incineration operating conditions.
|Appears in Collections:||環境工程學系所|
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