| The policy on the emission of flue gas from thermal power plants become more and more strict, for the flue gas always contains SO2 and NOx which result in acid rain and other environmental pollution hazard. Therefore, the removal of SO2 and NOx from flue gas has attracted considerable attention. Recently, developing a widly applied technology of desulfurization/denitrification is becoming a hot focus. At present, most of the desulfurization /denitrification technologies are carried out respectively, and the introduction of two respective equipments will lead to more investment and larger floor space, the simultaneous SO2/NOx removal technology could easily overcome these shortcomings.CuO/γ-Al2O3 dry flue gas desulfurization/denitrification technology has stood out from the crowd for it's plenty of advantages:high efficiency of desulfurization/denitrification, lower temperature of regeneration of catalyst and cycling utilization of catalyst. However, the research on this technology is commenced late in China and still remains in the laboratory research stage by now. So solving its problems in practical operation, so that it can be applied to production practice,is the urgent need for the domestic development of proprietary intellectual property rights on desulfurization/denitrification technology.At present,γ-Al2O3 spherical particles are widly used as the catalyst support in CuO/γ-Al2O3 dry flue gas desulfurization/denitrification technology, in contrast, there are fewer reports about the application of honeycomb catalyst which is mentioned in this paper. Therefore, the numerical simulation research on the honeycomb catalyst is carried out in details in the paper and aimed to offer some valuable data for the practical application of this technology.In this thesis, detailed numerical simulation researches on CuO/γ-Al2O3 dry flue gas desulfurization/denitrification technology were completed. Firstly, the single-tube physical models of four different catalyst forms were established and several parameters (velocity field, accretion distribution of DMP, efficiency of desulfurization/denitrification, resistance) are taken into account to select the the optimizational form for the catalyst. The chosen optimizational combination of different tube diameters and tube lengthes of the catalyst is established by abundant numerical simulation researches and by means of comparing the efficiency of desulfurization/denitrification and the accretion distribution of DMP. According to the optimizational conditions obtained above, the effects of the quantity of coating copper, the velocity of inlet flue gas, reaction temperature, ratio of NH3 and NO, concentration of oxygen on the activity of desulfurization/denitrification are involved; the condition that can reach higher desulfurization/denitrification efficiency is obtained according to them. Unsteady numerical simulation is introduced on the basis of the optimizational condition to calculate the most optimizational reaction time.Furthermore, the optimizational reaction temperature, inlet quantity of CH4, velocity, reaction time is obtained by numerical simulation on the regeneration of the catalyst. In order to explore the stability of the sorbents in regeneration progress and ensure the regeneration efficiency after repeated cycling, this paper makes numerical simulation on two kinds of sorbents (fresh and after several cycles), then gets the optimizational reaction time of regeneration process by means of unsteady numerical simulation.On the basis of the research above, this paper presents the idea of rotary reactor. The angle of every domain and optimizational rotary speed are determined according to the optimizational time of the desulfurization/denitrification and regeneration reaction above. In the following research, the initially designed rotary reactor of practical model of 600 MW set is defined and the numerical simulation is conducted, improving the structure of the reactor by resolving the problems occurred in the simulation. Finally, the three-dimensional model of the reactor in this thesis is shown by Auto CAD. |
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