In order to deeply understand the law of gas-solid flow in fluidized bedboiler

by taking the 1 MW circulating fluidized bed heat-electricity-gas poly-generation test bench in Zhejiang University as the research object

the open source software MFiX was used to simulate the gas components distribution and solid phase volume fraction at different pyrolysis temperatures(500/600/700 ℃). The simulation process was carried out by adopting Eulerian two-fluid model and Gidaspow drag model

which was widely used in numerical simulation of fluidized bed in computational fluid dynamics. The pyrolysis reaction subroutine was written in FORTRAN and the parallel simulation of three-dimensional model was realized based on OpenMpI technology. The results show that

the numerical simulation results can accurately predict the gas composition at furnace outlet. Moreover

a core-annulus structure(nearly ‘S' distribution) of axial solid volume fraction was also found in the furnace.