CFD Simulation of Woody Biomass Solid Waste Gasification Based on Thermal Energy Storage Fixed Bed Gasification Device
Based on the computational fluid dynamics dense discrete phase model,a numerical simulation model for a new thermal energy storage gasification device was established.The pre-treatment settings were optimized based on the gasification characteristics of an updraft fixed bed,and the distribution of fluid velocity,pressure,temperature and species in the furnace under different excess air coefficients was studied.The distribution and evolution law of the mass fractions of each species in the furnace at different times and under different excess air coefficients were analyzed.Research has shown that the particle bed is the main factor affecting fluid velocity and pressure drop,and gas flow through the bed generates a pressure drop of 50-75 Pa.The temperature field in the furnace presents an obvious drying-pyrolysis-reduction oxidation zone,and the temperature curves under various working conditions almost overlap,with approximately four inflection points.In the low excess air coefficient range,the increase in gasification agent flow rate has little effect on the species of gases.The design of the gasification device is conducive to improving the mass fraction of H2 and the ratio of CO/CO2 in the gas,effectively enhancing the calorific value of the gas.
updraft fixed beddense discrete phase modelexcess air coefficientphysical quantity distribution
万方数据
维普
