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摘要
With taking the effects of gasifier structure, particle size and reaction kinetics on gasification results into account, a comprehensive model of entrained flow gasifier was developed in this study, in which the particle residence time distribution was employed to characterize the particle flow behavior. Submodels of coal devolatilization, homogeneous and heterogeneous reactions, energy balance and heat transfer were included in this model. The simulation results of an OMB (opposed multi-burner) gasifier are in well agreement with industrial operating data. 1-D distributions of gas components, temperature and total carbon conversion in gasifier were obtained. Additionally, profiles of temperature and carbon conversion of particles with different diameters along normalized gasifier length are included as well. Following results can be observed quantitatively: Preheating, devolatilization and combustion of coal particles are completed in about 30 ms. Gasification of particle is the major process in gasifier. Small particles are heated rapidly and converted completely because of having high heat transfer and reaction rate. Carbon conversion ratio of the particles smaller than 100 μm reaches about 100 at the outlet of gasifier. However, for the particles larger than 200 μm, their temperature increases slowly and carbon conversion ratio is relatively lower.
- 出版日期2013
- 单位华东理工大学
