✍ Scribed by Caixia Chen; Masayuki Horio; Toshinori Kojima
No coin nor oath required. For personal study only.
A comprehensive model for entrained ¯ow coal gasi®ers was developed. In addition to the numerical methods and sub-models conventionally used in the modeling of pulverized coal combustion, a Multi Solid Progress Variables (MSPV) method was used to simulate the gasi®cation reaction and reactant mixing process. The gas ¯ow ®elds, gas temperature distributions, extent of burnout, and particle trajectories as well as particle concentrations within a two-stage air blown gasi®er and its four variations were predicted by using the simulation model. The simulation results provided reasonable explanation on the experimental observations and demonstrated the ability of the model to sensitively account for subtle changes in design parameters such as the throat diameter ratio and swirl ratios of burner injections. It was concluded that the throat diameter was critical for the gas ¯ow ®eld in the entrained ¯ow gasi®er, which might control the behavior of molten ash slag deposition on the gasi®er wall. The importance of selecting a proper swirl ratio for different burner sets was demonstrated.
📜 SIMILAR VOLUMES
The solar thermochemical decomposition of CH 4 is carried out in a solar reactor consisting of a cavity-receiver containing an array of tubular absorbers, through which CH 4 flows and thermally decomposes to H 2 and carbon particles. A reactor model is formulated by coupling radiation/convection/con