Simulation Study on Pressurized Jetting Fluidized Bed of Catalytic Coal Gasification to SNG
1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China; 2. University of the Chinese Academy of Sciences, Beijing 100049, China;3. ENN Group State Key Laboratory of Coal-based Low Carbon Energy, Langfang 065001, China
Abstract：A mathematics model was established to simulate the pressurized jetting fluidized bed gasifier of catalytic coal gasification to synthesis natural gas. The gasifier is simply divided into three zones: grid zone, bubble zone and freeboard zone. It is based on a one-dimensional steady-state model which considers the effects of pressured hydrodynamics (minimum fluidizing velocity, jet height and diameter, bubble diameter and velocity and bed expansion), mass and heat transfers, and catalytic reactions (char combustion, steam gasification, water-gas shift reaction and methanation) on the gasifier performances. The results show that the temperature of particles in jet zone almost reaches the maximum value when the oxygen is introduced, then decreases sharply and levels off. The hydrogen and carbon dioxide concentrations almost increase monotonically with the bed height, however the methane and carbon monoxide concentrations grow slowly. The maximal bubble size is about 0.11 m at 3.1 MPa, the slug phenomenon may not occur. The prediction bed temperature and gas compositions are in good agreement with experimental data.
