Drying Technics And Numerical Analysis Of Lignite Under Low Temperature Fume

There are some research about lignite drying technology at home and abroad now,however, there are not much lignite drying process which is mature.In this thesis,author use the existing small-scale experimental machine of lignite drying. And through experiment and numerical simulation, providing process parameters for the large-scale fluidized bed which drying lignite160t per hour. Including flue gas temperature, gas velocity and particle size of lignite.Through the known data in this thesis, according to the corresponding theoretical formula of fluid, author calculate the volume of theoretical flue gas,Plate speed and minimum fluidization velocity of each three-stage fluidized bed. To provide the basis for calculating of160t/h fluidized bed and a theoretical basis for numerical simulation Fluent.In the experiment, author research the impact of different temperatures on the lignite drying, the impact of different lignite particle sizes on the lignite drying,research the rate comparison between flow state and static state on the lignite drying, the impact of normal temperature air on the lignite drying, See if can Take the place of low-temperature flue gas or not to save energy.result shows feasible.Research the relationship between different wind speed and flow of fluidization. to provide the subsequent theory for fluent simulation.First according to known conditions take the simulation of small test machine in use of fluent Software. And comparison of experimental results and the experimental data, choose the right formula for drag force, take the numerical simulation of the160t/h fluidized bed.The results are in good agreement with the expected system design. According to the simulation results, choose the smaller size particles of lignite drying is good for effects of flow.