Investigation Of Combining With Dust Removal And Denitrification On The Catalyst Granular Layer

Due to high temperature resistance,high pressure resistant, anti-corrosion, wear resistance, non-ignitibility, non-explosion, high collection efficiency and stable filter capacity without the influence of dust specific resistance, Porous ceramic filter and granular layer filter are considered to be one of the most promising decontamination plant for middle or high temperature flue gas, and the most widely used commercial system-SCR is also running on the medium temperature(250-450℃).In this research, we load the SCR catalysts in Porous ceramic particles to make into the catalytic article dust-riding equipment, and realize the dust filtration process and denitrification process simultaneously on the middle temperature, it can save the cost greatly decrease resistance and reduce the land occupation.Firstly, it is researched to using the treated natural porous lava as matrix loaded in the vanadium-titanium catalyst by dipping method, test the activity of the catalysts and optimize the preparation of the catalyst by means of micro-reactor experiment platform and a variety of test and analysis equipment; studying the effects of various operating parameters (Temperature, O2concentration, ammonia/nitrogen) on denitration reaction in layer of catalyst particles, exploring the mechanism of catalyst particles layer reduction denitration. The results show that using middle temperature catalyst loaded in lava can achieve better results:Between200℃-375℃, it can keep higher efficiency, remained above70%; The larger oxygen, NO removal rate higher; the efficiency of NO removal is increased with the increase of ammonia/nitrogen, but the higher ammonia/nitrogen may increase the amount of unreacted NH3and lead to secondary pollution caused by NH3escape.Secondly, we test the denitration efficiency of business vanadium-titanium catalyst crushed into particles of1-2mm and the effect of temperature, particle size, ammonia/nitrogen, the concentration of oxygen, the height of the catalyst, SO2, water vapor, etc on the denitration efficiency. At300℃, ammonia nitrogen ratio of1,O2concentration of5%, the particles of1mm, the maximum efficiency can be89.7%.We also test the effect of O2content on the NO2generating, in future we can find a suitable catalyst to turn NO to NO2greatly, and remove NO2by washing with water or caustic eliminating the need for complex applications such as spraying ammonia.Last, we fit the existing catalytic denitration reaction data to obtain the equation of denitration catalyst reaction rate, simulate and calculate the effect of temperature, oxygen concentration, and residence time on denitrification efficiency that is good agreement with the experimental results; Using the existing filtration velocity, dust pressure drop data of particle dust-riding equipment to calculate filtering area, pressure drop, critical fluidization velocity, blowback velocity and blowback resistance.This paper proposed to load the SCR catalysts in Porous ceramic particles, or use the granular the commercial vanadium-titanium catalyst to make into the catalytic particle dust-riding equipment, and realize the dust filtration process and denitrification process simultaneously on the middle temperature, it can save the cost greatly, decrease resistance and reduce the land occupation. This research can provide a reference for the industrial applications of particle dust-riding and denitration.