Numerical Simulation Of Influence Of Secondary Air On Gas-solid Hydrodynamic In A 660 MW Supercritical CFB Boiler

In today's world,clean coal combustion technology is getting more and more attention.The circulating fluidized bed boiler has a strong adaptability to coal,the control of pollutant emission is better,and the load regulation ability is stronger.It is a clean coal power generation technology with high efficiency and low cost,and has broad application prospects.The large-scale and supercritical circulating fluidized bed boiler is the main trend of its development.However,in the process of its large-scale development,the gassolid flow characteristics,heat transfer and combustion of supercritical circulating fluidized bed boiler are still not fully grasped.At the same time,the problem of the secondary air penetration and outlet flow rate of the furnace are also need to be studied.In this paper,the actual size and numerical simulation of a 660 MW supercritical circulating fluidized bed(CFB)is studied by using Fluent engineering fluid simulation software.First of all,the characteristics of gas-solid flow in the furnace,the abrasion distribution of furnace and the uneven flow of furnace outlet are obtained by selecting the calculation model and numerical simulation method.Secondly,the depth of the secondary air jet in the furnace is mainly focused on,and the secondary air penetration optimization program is provided by the simulation results.Finally,by changing the parameters of the two wind,the influence of the secondary air on the gas-solid flow in the furnace,the secondary air penetration,and the abrasion of the wall were studied.