Numerical Simulation Of Activated Carbon Desulphurization From Flue Gas In Coal-Fired

Activated Carbon FGD.technology is a kind of flue gas desulfurization, which based on the adsorption principle,the activated carbon has some advantages,such as the large surface area,the good hole structure,the strong capacity of adsorptive,the good chemical stability etc.Comparing with the traditional wet flue gas desulfurization process,activated carbon flue gas desulfurization technology has the craft to be simple,the high of desulfurization efficiency,the low of investment,can be removed SO₃ by the wet is difficult to remove,the simplify operation,without the advantages of secondary pollution and so on,and recycling high-quality product for sulfuric acid.Therefore,the activated carbon desulfurization technology has been considered a FGD technology of highly development prospects,becomes a major competing technology by various countries' competition research development.So far,in the industrial application of adsorption sulfur recycling technology,among the variety of adsorption equipment which have already developed,the fixed bed and moving bed are most industrialization application.In recent years,many scientific and technical workers considered the existence's question of "activated carbon desulfurization technology"; researching concentrates in three areas:developing high-quality's activated carbon of high activity and the low cost,changing the operating conditions for improving the efficiency of activated carbon desulfurization,studing the way of different regeneration.On the basis of predecessor's studing,taking"raising the efficiency of activated carbon desulfurization" as the target,this article used two kind of different reactor-fixed bed and moving bed,through the theoretical analysis and the numerical simulation research,comparing of the pros and cons in structural style and the technological conditions of fixed bed and moving bed on the impact of flue gas desulphurization.The simulation selected the material transportation and limited chemical reaction rate model, turbulence model,porous medium model,Eulerian model in two-phase flow model.The simulation selected the granular activated carbon as the desulfurizer of flue gas,using the computational fluid dynamics(CFD)software,firstly, flue gas velocity field,the concentration of SO₃ and the pressure field were simulated in fixed bed and moving bed,the impact of activated carbon particles on flue gas flow in the reactor was studied,then the influence of operating parameters of the reactor on the activated carbon flue gas desulfurization was analyzed by changing the different technique conditions of fixed bed and moving bed(such as flue gas's velocity,bed's porosity,the concentration of SO₂,the temperature of flue gas's entrance,particles of different size etc.),finally it concluded that the structural parameters of reactors can affect the results of activated carbon flue gas desulfurization by means of converting the structural forms of reactors.