The air velocity of starting deposition of biomass particle conveyed by air in the fuel pipes of boilers

Abstract

Biomass fuel is promoted toward a target of net Greenhouse Gas zero emissions in 2050 that Japanese government announced last October 2020. IHI have supplied the co-firing power plants of 30cal% or more biomass pellets with coal. The biomass particles after pulverization by biomass mills are transported to the burners through the fuel pipes by air. Deposition of the biomass particles in fuel pipes on the way to a burner make a serious impact on the stable combustion and boiler operation. It is important to understand the conditions under which deposition occurs. However, the velocity of starting deposition is depended on the size and shape of the biomass particles. In this test, the transportation of two types of biomass particles is observed. This result suggests that the air velocity not to deposit is different depending on the shape of biomass particles.