Numerical Simulation On Flue Gas Desulfurization By Activated Carbon Absorption In Circulation Fluidized Bed

Activated carbon adsorption desulfurization technology is an available resourceof the high efficiency semi-dry desulfurization technology. Activated carbon having alarge specific surface area, good microporous structure, strong adsorption capacity,stable chemical properties and high mechanical characteristics. It is a good adsorbentmaterial which enables simultaneous desulfurization and denitrification. Further moreit also can promote utilization of renewable resources and prevent secondary pollution.Based on the current literature, the widely used absorption device of the activatedcarbon adsorption process can be divided into fix bed and moving bed. But thesetraditional process equipments exist some disadvantages which the equipment is tohuge, the bed have large resistance and poor continuity. Therefore these issues are animportant issue to be face.In circulating fluidized bed reactors used powdered activated carbon, caneffectively avoid the use of a fixed bed and moving bed reactors problems arising.Loop continuously with powdered activated carbon adsorption, can improve thedesulfurization efficiency relative to achieve good desulfurization effect. In this paper,on the basis of previous test was simulated to obtain good results simulation data, andthrough theoretical analysis verified the feasibility of the simulation. Through theanalysis of the results, affection of temperature, oxygen content, and the molar ratio ofcarbon and sulfur on the desulfurization efficiency. Further on powdered activatedcarbon desulfurization optimized analysis for future industrial production can providevaluable guidance.Simulation results show that:1. It can be seen through the simulation results obtained velocity cloud and cloudSO2concentration comparative analysis: Gas-solid flows velocity is1m/s in thefluidized bed and powdered activated carbon of the reaction time is about2seconds inthe reactor. At this relatively stable flow reactor, the reaction can be carried out morefully, the desulfurization effect reaches a relatively best.2. In the case of parameters without changing the other states, in a certaintemperature range, between the temperature313.15K to343.15K, as the temperaturerises, the desulfurization efficiency rises, about at65℃, the desulfurization achievesa more appropriate state.3. In the case of parameters without changing the other states, the oxygen contentin a certain range, O2volume fraction increased from2%to8%, with the increase of the oxygen content, the efficiency will be improved, the oxygen content at about6%,the desulfurization achieves a more appropriate status.4. In the case of parameters without changing the other states, in a certain rangeof the molar ratio of carbon and sulfur, the carbon-sulfur molar ratio of from20to100,with the increase of the molar ratio of carbon and sulfur, the desulfurization efficiencywill be improved, taking into account the combined effect of the approximately whenthe ratio is60, a more appropriate state is.achieved.