Polyaromatic Environmental Impact in Coal--Tire Blend Atmospheric Fluidized Bed (AFB) Combustion

摘要

It is the first time that in looking for a waste material use and trying to get cheaper power with a lower consumption of fossil fuel, a coal--tire blend (1:1 in organic matter) was burned in an atmospheric fluidized bed (AFB) combustion plant with an airflow of 860 L/h and 20/100 excess oxygen at three different combustion temperatures (750, 850, and 950 deg. C). The combustion conditions were the same as those used in AFB coal combustion in order to compare the organic emissions obtained with both fuels. As the inorganic components in tires are less and in lower amount than in coal, the work was focused on organic emissions. Organic emissions from each run were trapped and from each sample, after extraction by sonication with dimethylformamide (DMF), the content in polycyclic aromatic hydrocarbons (PAH) was determined by fluorescence spectroscopy in the synchronous mode (FS). It is concluded that the introduction of tire in the feeder implies an increase in total PAH amount emitted with respect to coal emissions, with minim variations at the combustion temperatures studied in this work: the higher the temperature, the lower the PAH amount emitted.