Method for predicting density and particle size distribution of particles in fluidized bed based on computational fluid mechanics

Abstract

The invention discloses a method for predicting density and particle size distribution of particles in a fluidized bed based on computational fluid mechanics. The method comprises the following steps: 1, building a basic flow reaction model in the fluidized bed; 2, building a mathematic model for describing the particle phase density and particle size change rule; and 3, predicting the density and particle size distribution states in the fluidized bed. According to the method, simulation study is carried out on the fluidized bed by a computational fluid mechanics method; real-time correction is carried out on the density and the particle sizes of the particles by combining the mathematic model for describing the particle phase density and particle size change rule, so that a theoretical basis is provided for accurate prediction of the density and particle size distribution states of the particles in the fluidized bed, and performance prediction, optimal control and design enlargement of the fluidized bed. According to the method, the density and particle size distribution states of the particles in the fluidized bed are obtained by the computational fluid mechanics method, and complicated sampling analysis on the actually running fluidized bed is not needed, so that a lot of manpower, material resources and time cost are reduced; and the method disclosed by the invention is a novel method for obtaining the density and particle size distribution states of the particles in the fluidized bed.

Description

technical field [0001] The invention relates to a new method for obtaining particle density and particle size distribution in a fluidized bed, in particular to a method for predicting particle density and particle size distribution in a fluidized bed based on computational fluid mechanics. Background technique [0002] The solid particles in the fluidized bed have some apparent characteristics of the fluid under the action of the fluid, and the surface of the particles can be fully exposed to the surrounding violently turbulent fluid, thereby enhancing heat transfer, mass transfer and chemical reactions, so it is widely used in Industrial fields such as pyrolysis, combustion or gasification of solid fuels such as biomass and coal. When particles such as biomass or coal undergo heterogeneous chemical reactions such as pyrolysis, combustion or gasification in a fluidized bed, they often follow a certain density and particle size change law, thus showing a certain density and p...

AI Technical Summary

Problems solved by technology

However, the density and particle size changes when particles undergo heterogeneous chemical reactions are often ignored in the existing fluidized bed computational fluid dynamics research. Therefore, the existing computational fluid dynamics methods still cannot accurately obtain the distribution state of particle density and particle size in the fluidized bed.

Images