Design Of2600m~3/h Flue Gas Desulfurization Device And Thermodynamics Analysis Of Denitration

Alumina red mud (ARM), a solid waste, discharged by Aluminium Industry hasnot been utilized in large scale due to its alkali properties. The passive accumulationof ARM not only brings problem of land occupation, but also serious pollutions of thesoil, air and groundwater. Meanwhile, a lot of flue gas from thermal-power plant alsohas caused serious environment pollution. This study comes from Henan majorcommonweal project “The Key Technology Research and Demonstration of ARM’sComprehensive Utilization With High Efficiency”, which aims at using ARM to treatflue gas in order to reduce its alkalinity and achieve its resourceful utilization as well.Firstly, the particle size, mineral composition, micro-structure of ARM weretested and analyzed by Grain-size Analyzer, XRD and SEM. The results showed thatthe wet flue gas desulfurization using ARM is feasible. The small sizeddesulfurization tower,1700×60mm was designed and installed on-site. The optimumprocess conditions were obtained by single factor experiments: the liquid-solid ratio7:1, the liquid-flue gas ratio15:1, the flue gas flow3.6m3/h. More than95%ofdesulfurization rate was obtained. Moreover, the continuous operations were done byOrthogonal Test. The desulfurization can operate steadily and meet the NationalEmission Standard by adding10%of the fresh slurry when the pH=5.9.Secondly, according to the emission standard, the experimental results listedabove, the size of the site and with reference to the national design standards, TowerEquipment, Process Equipment Design and other technical regulation,5700×1000mm sized spray tower was designed based on2600m3/h flue gas flow and95%desulfurization rate. The tower material was16MnR steel. The wall thicknessof the tower was6mm determined by hydraulic pressure test check. Moreover, thespray layers, the types, materials, number and spatial arrangement of the nozzleswere also designed. Meanwhile, the testing and controlling instruments wereselected.Finally, the preliminary research of removal of NOXin flue gas was studied.Energy consumption in different processes of pyrolysis and pyrolysis-hydrolysis withdifferent concentrations of urea solution at different temperatures were calculated and analyzed. The results showed that the heat required for pyrolysis-hydrolysis processof50%urea solution at700K was only307.177kJ mol-1, which is low energyconsumption with high ammonia yield.Looking forward to the design and the results of research can provide somereference and guidance for industrialization of ARM flue gas desulferization.