Volatilization Of Arsenic,Mercury And Other Volatiles During Biomass Combustion

There are abundant biomass energy reserves in the world,if them can be used rationally,the energy crisis and serious environmental pollut ion that brought by the use of fossil energy will no longer be a problem.In addit ion,due to the content of carbon in biomass comes from the atmosphere,thus the discharge of carbon dioxide can be regard as zero.Alt hough,biomass is a clean,green energy comparing wit h fossil energy,a large concentrate combustion of biomass will still have great harmful influence to the environment.To explore the emission of volatiles during the combustion of biomass fue ls,eight common biomass samples coming from different province in C hina were analyzed by comb ined the Thermogravimetry,Fourier Transform Infrared spectrum(FTIR)and Mass Spectrometry;the Lumex mercury analyzer was used to study the emission of mercury;the combus ion experiments and atomic fluorescence spectroscopy were comb ined to explore the release of arsenic during the combusion of bio mass.The results show: The mercury contents were 1-44 ng�g-1,and the arsenic contents of which were 100-1100 ng�g-1.Steps associated wit h moist ure loss,oxidation of volatiles,oxidation of char and degradation of some salts were observed.An addit iona l step was observed for tobacco prior to 200 ? which is likely related to the oxidation of hemicellulose and cellulose.Almost all of the mercury emission from biomass samples occurred between 200~ 450?.The decomposit ion and oxidation of organic-bound arsenic occurred between 200~600 ? while the decomposit ion of sulfide-bound arsenic occurred between 600~ 800 ?.Fifty percent of the arsenic still remained even at 1000?.