Experimental Research And Numerical Simulation Of Activated Coke Desulfurization In Coal-fired Power Plant

China's environmental problems have become increasingly serious in recent years. Reducing and controlling SO2 emissions become an urgent problem. Currently, wet flue gas desulphurization technology is widely used in China, but it has some disadvantages, such as secondary pollution, large water consumption, and unrecyclable sulfur resource. Activated coke flue gas desulphurization is an advanced dry desulfurization technology. Its desulfurization efficiency is high and the desulfurization process consumes no water and does not produce waste water and waste residue. Desulfurization product is a high concentration of SO2 that can be used to produce sulfuric acid and other products, which has good prospect for development in China. To promote activated coke desulfurization technology in coal-fired power plants, this paper mainly uses the means of experimental research and numerical simulation to study the effect of different factors on the activated coke desulfurization.This paper summarizes the status of development in the domestic and international research on activated coke flue gas desulphurization and the main process. The basic theory of activated coke desulfurization is introduced; pore structure and functional group composition of activated coke are analyzed. The structure and elemental composition of the activated coke samples are studied by using experimental instruments. Activated coke desulfurization process parameters are studied on the test bench of activated coke in the small fixed bed built in the laboratory.The impact of several process parameters such as flue gas SO2 concentrations, O2 concentration, water vapor concentration, bed temperature and superficial velocity on the activated coke desulfurization efficiency was studied. The results show that when SO2 concentration is 2000mg/m3, O2 concentration 6vol%, water vapor concentration 7vol%, the bed temperature of 120?, they are optimum process parameters. In addition, breakthrough test is also finished on the activated coke fixed bed desulfurization system. Breakthrough curves can be obtained under different flue gas flow. When flue gas flow is 60m3/h, 30m3/h, 15m3/h, their breakthrough time is 6.83 h, 12 h, 22.63 h respectively.The research objects of this paper are fixed bed and moving bed. The inside flow field distribution is simulated by Fluent software. The simulated results reflect the actual utilization of activated coke and provide reference data for the analysis of activated coke desulfurization dynamic adsorption process. According to the material balance equation, the linear driving force and mass transfer rate equation and the Langmuir adsorption isotherm equation, mathematical model is established and analyzed by MATLAB software. The model is used to analyze the impact of penetration characteristics on the porosity, maximum adsorption capacity, SO2 inlet concentration, superficial linear velocity. The results indicate that changing the porosity has no significant effect on the penetration curve. The breakthrough time will increase with the increase of the maximum adsorption capacity. The breakthrough time will shorten with the increase of superficial linear velocity and the SO2 inlet concentration. These results provide theoretical guidance for activated coke desulfurization in engineering design of coal-fired power plants.