Numerical Simulation Of CO Gaseous Fuel Chemical Looping Combustion System

Chemical Looping Combustion technology is a new type of flameless combustion method.It provides a good technical solution for improving combustion efficiency and controlling pollutant emissions.It plays an important role in many current combustion methods,and the work of chemical chain system.The principle is to divide the traditional direct combustion process into two parts,Firstly,the oxygen-carrying medium in the air is oxidized by the circulating oxygen carrier medium,Secondly,the oxygen in the air is absorbed to generate the oxygen-carrying particles in the oxygen-carrying state.And the reduction reaction of the gaseous fuel releases heat,thereby completing the combustion process.In this paper,the Chemical Looping Combustion process is studied by numerical simulation,The Chemical Looping Combustion system mainly comprises two parts of an air reactor and a fuel reactor,and performs an oxidation reaction in the air reactor;in the fuel reactor,the oxidized oxygen carrier and the fuel undergo a reduction reaction to release heat to complete combustion.Therefore,this paper will select the air reactor,fuel reactor and whole bed as simulation objects for simulation analysis,including:simulation of fluidization process in air reactor,bubbling flow in fuel reactor The state and combustion process were simulated and the flow process of the reactor bed was simulated.The simulation method is the Euler-Lagrangian and the model based on the DDPM?dense discrete phase?model.The gaseous fuel is CO,and the oxygen carrier is Fe₂O₃.The different condition at different times in the reactor.It includes:analyzing the particle flow characteristics in the air reactor at different speeds based on the DDPM model,analyzing the concentration distribution,velocity distribution,pressure distribution simulation results at different positions;concentration distribution at different positions in the fuel reactor,velocity distribution,pseudo-particle temperature distribution,pressure distribution and gas product composition distribution of combustion reaction;volume fraction distribution,velocity distribution,turbulent viscosity distribution and pressure distribution of chemical chain system whole-bed flow process.Analysis of the simulation results shows that the DDPM model considers the volume interaction between the particles,and the results can more accurately reflect the true motion condition of the particle phase,which provides a theoretical guidance for the subsequent model improvement work.