Thermogravimetric analysis of the combustion of microalgae and microalgae blended with waste in N_2/O_2 and CO_2/O_2 atmospheres

摘要

The combustion of microalgae and municipal solid waste (MSW) under N_2/O_2 and CO_2/O_2 atmospheres was analyzed using a thermogravimetric instrument. The onset temperature of volatile release (T_v), maximum rate of weight loss (Rmax) and the temperature at the maximal peak (Tmax) were measured. As the blending ratio of microalgae was increased from 10% to 70% under N_2/O_2 atmosphere, Tv decreased from 269.4 to 247.4°C, Tmax decreased from 310.8 to 288.0°C, Rmax decreased from 11.94% to 7.88% and residual weight decreased from 30% to 20%. Thus, blending with microalgae can improve MSW combustion. The type of atmosphere did not affect T_v and T_(max), but replacement of N_2 by CO_2, resulted in the later appearance of the small humps (>600°C) in the mass loss and rate of weight loss curves, burnout was less complete, and Rmax was lower, thus some improvement measures, such as an increase in oxygen concentration, are required under CO_2/O_2 atmosphere to achieve the same combustion performances in air.