Abstract
The fossil fuel consumption and pollutant emissions in a coal fired fluidized bed boiler could be reduced by biomass pyrolysis gas reburning. The influence of three kinds of biomass pyrolysis gases on the emission of N2O in a laboratory scale fluidized bed was investigated using the mechanism of GRI3.0 in this paper. The results showed that: the effect of sawdust pyrolysis gas reburning on N2O was more significant than that of rice husk and orange peel under the same conditions; the increase of initial oxygen content from 1% to 8% in flue gas would restrain the decomposition of N2O; the N2O decomposition was enhanced by increasing reaction temperature from 1073.15 K to 1323.15 K, and the decomposition rate may reach 99% at 1223.15 K.
Highlights
The results showed that: the effect of sawdust pyrolysis gas reburning on N2O was more significant than that of rice husk and orange peel under the same conditions; the increase of initial oxygen content from 1% to 8% in flue gas would restrain the decomposition of N2O; the N2O decomposition was enhanced by increasing reaction temperature from 1073.15 K to 1323.15 K, and the decomposition rate may reach 99% at 1223.15 K
The results showed that the reduction effect of sawdust pyrolysis gas was better than that of orange peel and rice husk
The variation trend of different biomass pyrolysis gas influenced by initial oxygen content was consistent
Summary
Reburning gas from sawdust, rice husk, and orange peel is produced by fast pyrolysis process at a temperature of 1123.15 K. Proximate analysis and pyrolysis gas components of them were given in [28]. In the chemical reaction process, the following assumptions have been made: (1) Biomass pyrolysis gas and flue gas were mixed perfectly before en-. Tering the reaction tube; (2) the influence of mixing in the actual process was ignored; (3) The defined temperature at the inlet of the reactor was reached instantly, and the influence of temperature rise was ignored; (4) The plug flow model was used. The reaction mechanism was based on GRI3.0, which contains 325 chemical reactions and 53 species, whose detail information of species was given at Table 1. Where N2Oin and N2Oout are the mole fraction of N2O before and after the reaction respectively; NOout and NO2out are the mole fraction of NO and NO2 after the reaction respectively
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