Investigation On PM₁₀ And The Distribution Of Trace Elements During Co-combustion Of Biomass With Coal

Biomass, as a renewable and environmental energy, which co-combusts with coal, can not only reduce SOx, NOx and CO2, but also has influence on PM10. The formation and control of fine particulate matter from coal combustion has become a hot research area and is going to attract more attention in the future. Some research achievements have already indicated that the formation of inhalable particles during biomass combustion is easier than that of coal combustion. The inhalable particles, however, which are produced from biomass, can be captured easily during co-combustion of biomass with coal. Due to the resources of biomass in our country are abundant, developing the technic of co-combustion of biomass with coal has great significance.Firstly, the co-combustion of sawdust with Pingdingshan coal is investigated by using a Drop Tube Furnace(DTF) in this paper. Mixtures of coal with three different mass percent of sawdust are burnt under three temperatures separately. The results indicate that sawdust addition can reduce the mass percent of PM2.5. Enrichments of Cr and Zn in PM10 are affected by the emission characteristics of PM10 strongly.Then, two kinds of biomasses and coals are selected, which were mixed at ratio of 1:3. Four kinds of mixture compounds are also burnt by using the Drop Tube Furnace under a constant temperature and two different atmospheres. The results indicate that the distribution of PM10 during co-combustion is similar to coal combustuion. With the increasing of oxygen, the concentration of sub-micron and super-micron particles increase. The enrichment of Pb in PM10 is much higher than that of other trace metals.