Papers by Author: Ya Nan Zhang

Abstract: This paper works with the CFD simulation of the process of pyrolysis of lignite particles in a downstream fluidized bed, which actually means the particles would fall down from the injection point and escape the furnace from the bottom. The particle track is solved by using the Lagrangian approach, while the flow of the inert gas (nitrogen) is dealt with by the Eulerian approach. The heat transferred from the nitrogen gas to the surface of particle is computed by means of the famous Ranz-Marshall correlation. The chemical reactions are simulated using part of the coal combustion model inserted in the commercial software used.

Abstract: A novel kind of high gravity device-rotating zigzag bed (RZB) was developed. The RZB is a kind of high efficiency gas-liquid contactor and a promising alternative in chemical process industries. However, because of the complexity of fluid flow inside the RZB, the flow experiments do not easily lead to the deeper understanding on the fluid dynamics in an RZB. This paper works with the CFD simulation of the process of RZB. Different gas flow velocities, rotating speed are comprehensively and systematically observed. The preliminary simulation results show that the models used to describe the RZB can give rise to better understanding of the flow in an RZB.