Experimental Study Of Simultaneous Desulfurization And Denitrification By Urea/Ammonia/Triethanolamine

The methods of traditional flue gas pollution control are a device to deal with a pollutant, and dust removal, desulfurization or denitrification require different treatment facilities. However, the disadvantages of the large investment, the high operation cost, and the big occupying land were obvious. The research and development of the new desulfurization and denitrification integration process can solve the existing problems of the traditional process. With the continuous improvement of air pollution and air pollution control standards, the development of high-efficiency and low-cost desulfurization and denitrification integration technology have been extremely urgent.In this study, the mechanism and feasibility were firstly analyzed from the points of the "adsorption-mass transfer" theory, the thermodynamics, and the kinetics, providing the theoretical guidance for the next test.The mixed adsorption system of urea/ammonia water by adding triethanolamine as the sole additive for the removal of SO2and NOx from the simualted coal-fired flue gas was studied using a experiment-scale absorption tower. The effects of the urea concentration, the ammonia concentration, the flow rate of the simulated flue gas, the ratio of gas/liquid, the triethanolamine concentration, the reaction temperature, and the initial contration of SO2/NOx on the removal efficiency of the pollutants were investigated. The correspondingly optimum reaction conditions were finally achieved, namely0.3%of the urea concentration (mass ration),0.3%of the ammonia concentration (volume ratio),20m3/h of the flow rate,20L/m3of the liquid/gas ratio,0.02%of the triethanolamine concentration,20℃of the temperature. Under these optimum conditions,97%removal of SO2and60%removal of NOx were achieved simultaneously, and the synergistic effect for the removal of the both pollutants using one absorption tower was proved.This method has a lot of advantages, including the simple process, easier operation, lower one-time investment and operation cost, small occupying area, and the recyclable secondary pollutants, which is in line with China’s circular economy and sustainable development concept.