Abstract
Circulating fluidized bed (CFB) boiler is applied for peak-load
regulation nowadays, with the rapid increase of renewable energy
generation in the power grid. However, due to the huge inertia in CFB
system, it is important to investigate the operational characteristics
of CFB boiler to achieve depth peak load cycling. In this study, a
one-dimensional dynamic model for gas-solid hydrodynamics in a full-loop
CFB boiler is established. The model was validated by the field test
data of a 350 MW supercritical CFB boiler. The impact of the changing
speed for extra operating conditions, the total bed inventory, and the
size distribution of the feeding ash particles under the load reduction
process were analyzed. The results show that there is an optimal load
changing rate under load reduction process. The total bed inventory
being higher and feeding relatively larger particles benefit to achieve
a better performance in a load reduction process.