高密度円筒バイオマスブリケット端面燃焼挙動への二次空気供給の影響

抄録

It is expected that the end face combustion of biomass columnar briquette in which pyrolysis and combustion region is limited to one end and propagates to another end with constant rate can obtain a constant heat release rate. In the previous study, it was found that a long char combustion region is formed because the char combustion rate is smaller than that of pyrolysis and flaming combustion, whereas steady end face combustion was obtained. To enhance the char combustion, the secondary air is supplied only to the char combustion region to avoid interference from the secondary air on the flame formed around the cylindrical briquette in this study. The influences of the secondary air flow rate on the length of the char combustion region, the mass loss rate and the combustion efficiency are investigated. By supplying the secondary air, the maximum temperature of the char combustion region increases and the length of the char combustion region decreases. The mass loss rate of the briquette increases with increasing the secondary air flow rate without significant influence on the combustion efficiency in relatively wide secondary air flow range.